# Objective
The method `QueryState::par_iter` does not currently force the query to
be read-only. This means you can unsoundly mutate a world through an
immutable reference in safe code.
```rust
fn bad_system(world: &World, mut query: Local<QueryState<&mut T>>) {
query.par_iter(world).for_each_mut(|mut x| *x = unsoundness);
}
```
## Solution
Use read-only versions of the `WorldQuery` types.
---
## Migration Guide
The function `QueryState::par_iter` now forces any world accesses to be
read-only, similar to how `QueryState::iter` works. Any code that
previously mutated the world using this method was *unsound*. If you
need to mutate the world, use `par_iter_mut` instead.
# Objective
Make a combined system cloneable if both systems are cloneable on their
own. This is necessary for using chained conditions (e.g
`cond1.and_then(cond2)`) with `distributive_run_if()`.
## Solution
Implement `Clone` for `CombinatorSystem<Func, A, B>` where `A, B:
Clone`.
# Objective
- Fixes#8782
## Solution
- Call `init_resource` on `register_diagnostic` so that a
`DiagnosticStore` gets initialized if it does not exist.
---------
Co-authored-by: François <mockersf@gmail.com>
# Objective
The `extract` function is given the main app world, and the subapp, not
vice versa as the comment would lead us to believe.
## Solution
Fix the doc.
# Objective
- Rename the `render::primitives::Plane` struct as to not confuse it
with `bevy_render::mesh::shape::Plane`
- Fixes https://github.com/bevyengine/bevy/issues/8730
## Solution
- Refactor the `render::primitives::Plane` struct to
`render::primitives::HalfSpace`
- Modify documentation to reflect this change
## Changelog
- Renamed `Plane` to `HalfSpace` to more accurately represent it's use
- Renamed `planes` member in `Frustum` to `half_spaces` to reflect
changes
## Migration Guide
- `Plane` has been renamed to `HalfSpace`
- `planes` member in `Frustum` has been renamed to `half_spaces`
---------
Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
Co-authored-by: Nicola Papale <nicopap@users.noreply.github.com>
# Objective
When browsing the bevy source code to try and learn about
`bevy_core_pipeline`, I noticed that the `DrawFunctions` resources,
`sort_phase_system`s and texture preparation for the `Opaque3d` and
`AlphaMask3d` phase items are all set up in `bevy_core_pipeline`, while
the `Opaque3dPrepass` and `AlphaMask3dPrepass` phase items are only
*declared* in `bevy_core_pipeline`, and actually registered properly
with the renderer in `bevy_pbr`.
This means that, if I am trying to make crate that replaces `bevy_pbr`,
I need to make sure I manually fix this unfinished setup the same way
that `bevy_pbr` does. Worse, it means that if I try to use the
`PrepassNode` `bevy_core_pipeline` adds *without* fixing this, the
engine will simply crash because the `DrawFunctions<T>` resources cannot
be accessed.
The only advantage I can think of for bevy doing it this way is an
ambiguous performance save due to the prepass render phases not being
present unless you are using prepass materials with PBR.
## Solution
I have moved the registration of `DrawFunctions<T>`,
`sort_phase_system::<T>`, camera `RenderPhase` extraction, and texture
preparation for prepass's phase items into `bevy_core_pipeline`
alongside the equivalent code that sets up the `Opaque3d`, `AlphaMask3d`
and `Transparent3d` phase items.
Am open to tweaking this to improve the performance impact of prepass
things being around if the app doesn't use them if needed.
I've tested that the `shader_prepass` example still works with this
change.
# Objective
The AccessKit PR removed the loading of the image logo from the UI
example.
It also added some alt text with `TextStyle::default()` as a child of
the logo image node.
If you give an image node a child, then its size is no longer determined
by the measurefunc that preserves its aspect ratio. Instead, its width
and height are determined by the constraints set on the node and the
size of the contents of the node. In this case, the image node is set to
have a width of 500 with no constraints on its height. So it looks at
its child node to determine what height it should take. Because the
child has `TextStyle::default` it allocates no space for the text, the
height of the image node is set to zero and the logo isn't drawn.
Fixes#8805
## Solution
Load the image, and set min_size and max_size constraints of 500 by 125
pixels.
# Objective
EntityRef::get_change_ticks mentions that ComponentTicks is useful to
create change detection for your own runtime.
However, ComponentTicks doesn't even expose enough data to create
something that implements DetectChanges. Specifically, we need to be
able to extract the last change tick.
## Solution
We add a method to get the last change tick. We also add a method to get
the added tick.
## Changelog
- Add `last_changed_tick` and `added_tick` to `ComponentTicks`
# Objective
- Fixes#8811 .
## Solution
- Rename "write" method to "apply" in Command trait definition.
- Rename other implementations of command trait throughout bevy's code
base.
---
## Changelog
- Changed: `Command::write` has been changed to `Command::apply`
- Changed: `EntityCommand::write` has been changed to
`EntityCommand::apply`
## Migration Guide
- `Command::write` implementations need to be changed to implement
`Command::apply` instead. This is a mere name change, with no further
actions needed.
- `EntityCommand::write` implementations need to be changed to implement
`EntityCommand::apply` instead. This is a mere name change, with no
further actions needed.
---------
Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
# Objective
- I can't map unsized type using `Ref::map` (for example `dyn Reflect`)
## Solution
- Allow unsized types (this is possible because `Ref` stores a reference
to `T`)
# Objective
`QueryState` exposes a `get_manual` and `iter_manual` method. However,
there is now `iter_many_manual`.
`iter_many_manual` is useful when you have a `&World` (eg: the `world`
in a `Scene`) and want to run a query several times on it (eg:
iteratively navigate a hierarchy by calling `iter_many` on `Children`
component).
`iter_many`'s need for a `&mut World` makes the API much less flexible.
The exclusive access pattern requires doing some very funky dance and
excludes a category of algorithms for hierarchy traversal.
## Solution
- Add a `iter_many_manual` method to `QueryState`
### Alternative
My current workaround is to use `get_manual`. However, this doesn't
benefit from the optimizations on `QueryManyIter`.
---
## Changelog
- Add a `iter_many_manual` method to `QueryState`
# Objective
Title.
---------
Co-authored-by: François <mockersf@gmail.com>
Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
Co-authored-by: James Liu <contact@jamessliu.com>
# Objective
`Ref` is a useful way of accessing change detection data.
However, unlike `Mut`, it doesn't expose a constructor or even a way to
go from `Ref<A>` to `Ref<B>`.
Such methods could be useful, for example, to 3rd party crates that want
to expose change detection information in a clean way.
My use case is to map a `Ref<T>` into a `Ref<dyn Reflect>`, and keep
change detection info to avoid running expansive routines.
## Solution
We add the `new` and `map` methods. Since similar methods exist on `Mut`
where they are much more footgunny to use, I judged that it was
acceptable to create such methods.
## Workaround
Currently, it's not possible to create/project `Ref`s. One can define
their own `Ref` and implement `ChangeDetection` on it. One would then
use `ChangeTrackers` to populate the custom `Ref` with tick data.
---
## Changelog
- Added the `Ref::map` and `Ref::new` methods for more ergonomic `Ref`s
---------
Co-authored-by: Gino Valente <49806985+MrGVSV@users.noreply.github.com>
# Objective
- Some reflect components weren't properly registered.
## Solution
- We register them
- I also sorted the register lines in `Plugin::build` in `bevy_ui`
### Note
How I did I find them:
- I picked up the list of `Component`s from the `Component` trait page
in rustdoc.
- Then I tried to register all of them. Removing the registration when
it doesn't implement `Reflect` to pass compilation.
- Then I added `app.register_type_data::<T, Foo>()`, for all Reflect
components. It panics if `T` is not registered.
- I repeated the last line N times until bevy stopped panicking at
startup
---
## Changelog
- Register the following components: `PrimaryWindow` `Fxaa`
`FogSettings` `NotShadowCaster` `NotShadowReceiver` `CalculatedClip`
`RelativeCursorPosition`
`AlphaMode` is not used as a component anywhere in the engine. It
shouldn't implement `Component`. It might mislead users into thinking it
has any effect as a component.
---
## Changelog
- Remove `Component` implementation for `AlphaMode`. It wasn't used by
anything.
## Migration Guide
`AlphaMode` is not a component anymore.
It wasn't used anywhere in the engine. If you were using it as a
component for your own purposes, you should use a newtype instead, as
follow:
```rust
#[derive(Component, Deref)]
struct MyAlphaMode(AlphaMode);
```
Then replace uses of `AlphaMode` with `MyAlphaMode`
```diff
- Query<&AlphaMode, …>,
+ Query<&MyAlphaMode, …>,
```
# Objective
- When a window is closed, the associated camera keeps rendering even if
the RenderTarget isn't valid anymore.
- This is essentially just wasting a lot of performance.
## Solution
- Detect the window close event and disable any camera that used the
window has a RenderTarget.
## Notes
It's possible a similar thing could be done for camera that use an image
handle, but I would fix that in a separate PR.
# Objective
`NoFrustumCulling` doesn't implement `Reflect`, while nothing prevents
it from implementing it.
## Solution
Implement `Reflect` for it.
---
## Changelog
- Add `Reflect` derive to `NoFrustrumCulling`.
- Add `FromReflect` derive to `Visibility`.
# Objective
This calculation is performed componentwise but all the values are
vectors so it should be using vector operations.
Works correctly with the `relative_cursor_position` example.
# Objective
To upgrade winit's dependency, it's useful to reuse SmolStr, which
replaces/improves the too restrictive Key letter enums.
As Input<Key> is a resource it should implement Reflect through all its
fields.
## Solution
Add smol_str to bevy_reflect supported types, behind a feature flag.
This PR blocks winit's upgrade PR:
https://github.com/bevyengine/bevy/pull/8745.
# Current state
- I'm discovering bevy_reflect, I appreciate all feedbacks, and send me
your nitpicks!
- Lacking more tests
---------
Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
Co-authored-by: Gino Valente <49806985+MrGVSV@users.noreply.github.com>
# Objective
The goal of this PR is to receive touchpad magnification and rotation
events.
## Solution
Implement pendants for winit's `TouchpadMagnify` and `TouchpadRotate`
events.
Adjust the `mouse_input_events.rs` example to debug magnify and rotate
events.
Since winit only reports these events on macOS, the Bevy events for
touchpad magnification and rotation are currently only fired on macOS.
Updates the requirements on
[notify](https://github.com/notify-rs/notify) to permit the latest
version.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/notify-rs/notify/blob/main/CHANGELOG.md">notify's
changelog</a>.</em></p>
<blockquote>
<h2>notify 6.0.0 (2023-05-17)</h2>
<ul>
<li>CHANGE: files and directories moved into a watch folder on Linux
will now be reported as <code>rename to</code> events instead of
<code>create</code> events <a
href="https://redirect.github.com/notify-rs/notify/issues/480">#480</a></li>
<li>CHANGE: on Linux <code>rename from</code> events will be emitted
immediately without starting a new thread <a
href="https://redirect.github.com/notify-rs/notify/issues/480">#480</a></li>
<li>CHANGE: raise MSRV to 1.60 <a
href="https://redirect.github.com/notify-rs/notify/issues/480">#480</a></li>
</ul>
<h2>debouncer-mini 0.3.0 (2023-05-17)</h2>
<ul>
<li>CHANGE: upgrade to notify 6.0.0, pushing MSRV to 1.60 <a
href="https://redirect.github.com/notify-rs/notify/issues/480">#480</a></li>
</ul>
<h2>debouncer-full 0.1.0 (2023-05-17)</h2>
<p>Newly introduced alternative debouncer with more features. <a
href="https://redirect.github.com/notify-rs/notify/issues/480">#480</a></p>
<ul>
<li>FEATURE: only emit a single <code>rename</code> event if the rename
<code>From</code> and <code>To</code> events can be matched</li>
<li>FEATURE: merge multiple <code>rename</code> events</li>
<li>FEATURE: keep track of the file system IDs all files and stiches
rename events together (FSevents, Windows)</li>
<li>FEATURE: emit only one <code>remove</code> event when deleting a
directory (inotify)</li>
<li>FEATURE: don't emit duplicate create events</li>
<li>FEATURE: don't emit <code>Modify</code> events after a
<code>Create</code> event</li>
</ul>
<p><a
href="https://redirect.github.com/notify-rs/notify/issues/480">#480</a>:
<a
href="https://redirect.github.com/notify-rs/notify/pull/480">notify-rs/notify#480</a></p>
<h2>notify 5.2.0 (2023-05-17)</h2>
<ul>
<li>CHANGE: implement <code>Copy</code> for <code>EventKind</code> and
<code>ModifyKind</code> <a
href="https://redirect.github.com/notify-rs/notify/issues/481">#481</a></li>
</ul>
<p><a
href="https://redirect.github.com/notify-rs/notify/issues/481">#481</a>:
<a
href="https://redirect.github.com/notify-rs/notify/pull/481">notify-rs/notify#481</a></p>
<h2>notify 5.1.0 (2023-01-15)</h2>
<ul>
<li>CHANGE: switch from winapi to windows-sys <a
href="https://redirect.github.com/notify-rs/notify/issues/457">#457</a></li>
<li>FIX: kqueue-backend: batch file-watching together to improve
performance <a
href="https://redirect.github.com/notify-rs/notify/issues/454">#454</a></li>
<li>DOCS: include license file in crate again <a
href="https://redirect.github.com/notify-rs/notify/issues/461">#461</a></li>
<li>DOCS: typo and examples fixups</li>
</ul>
<p><a
href="https://redirect.github.com/notify-rs/notify/issues/454">#454</a>:
<a
href="https://redirect.github.com/notify-rs/notify/pull/454">notify-rs/notify#454</a>
<a
href="https://redirect.github.com/notify-rs/notify/issues/461">#461</a>:
<a
href="https://redirect.github.com/notify-rs/notify/pull/461">notify-rs/notify#461</a>
<a
href="https://redirect.github.com/notify-rs/notify/issues/457">#457</a>:
<a
href="https://redirect.github.com/notify-rs/notify/pull/457">notify-rs/notify#457</a></p>
<h2>debouncer-mini 0.2.1 (2022-09-05)</h2>
<ul>
<li>DOCS: correctly document the <code>crossbeam</code> feature <a
href="https://redirect.github.com/notify-rs/notify/issues/440">#440</a></li>
</ul>
<p><a
href="https://redirect.github.com/notify-rs/notify/issues/440">#440</a>:
<a
href="https://redirect.github.com/notify-rs/notify/pull/440">notify-rs/notify#440</a></p>
<h2>debouncer-mini 0.2.0 (2022-08-30)</h2>
<p>Upgrade notify dependency to 5.0.0</p>
<!-- raw HTML omitted -->
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Updates the requirements on
[ruzstd](https://github.com/KillingSpark/zstd-rs) to permit the latest
version.
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Followup to #7184
This makes `Reflect: DynamicTypePath` which allows us to remove
`Reflect::get_type_path`, reducing unnecessary codegen and simplifying
`Reflect` implementations.
# Objective
Be consistent with `Resource`s and `Components` and have `Event` types
be more self-documenting.
Although not susceptible to accidentally using a function instead of a
value due to `Event`s only being initialized by their type, much of the
same reasoning for removing the blanket impl on `Resource` also applies
here.
* Not immediately obvious if a type is intended to be an event
* Prevent invisible conflicts if the same third-party or primitive types
are used as events
* Allows for further extensions (e.g. opt-in warning for missed events)
## Solution
Remove the blanket impl for the `Event` trait. Add a derive macro for
it.
---
## Changelog
- `Event` is no longer implemented for all applicable types. Add the
`#[derive(Event)]` macro for events.
## Migration Guide
* Add the `#[derive(Event)]` macro for events. Third-party types used as
events should be wrapped in a newtype.
# Objective
It was accidentally found that rustc is unable to parse certain
constructs in `where` clauses properly. `bevy_reflect::Reflect`'s habit
of copying and pasting the field types in a type's definition to its
`where` clauses made it very easy to accidentally run into this
behaviour - particularly with the construct
```rust
where
for<'a> fn(&'a T) -> &'a T: Trait1 + Trait2
```
which was incorrectly parsed as
```rust
where
for<'a> (fn(&'a T) -> &'a T: Trait1 + Trait2)
^ ^ incorrect syntax grouping
```
instead of
```rust
where
(for<'a> fn(&'a T) -> &'a T): Trait1 + Trait2
^ ^ correct syntax grouping
```
Fixes#8759
## Solution
This commit fixes the issue by inserting explicit parentheses to
disambiguate types from their bound lists.
# Objective
- Fixes https://github.com/bevyengine/bevy/issues/8586.
## Solution
- Add `preferred_theme` field to `Window` and set it when window
creation
- Add `window_theme` field to `InternalWindowState` to store current
window theme
- Expose winit `WindowThemeChanged` event
---------
Co-authored-by: hate <15314665+hate@users.noreply.github.com>
Co-authored-by: Nicola Papale <nicopap@users.noreply.github.com>
Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
Co-authored-by: François <mockersf@gmail.com>
# Objective
Fixes#8751
## Solution
The doc string for the `primary_window` field on `Window` now mentions
that the default spawned primary window is spawned with the
`PrimaryWindow` marker component.
---------
Co-authored-by: François <mockersf@gmail.com>
# Objective
- Fix#8658
- `without_winit` example panics `thread 'Compute Task Pool (2)'
panicked at 'called `Option::unwrap()` on a `None` value',
crates/bevy_render/src/pipelined_rendering.rs:134:84`
## Solution
- In the default runner method `run_once`, correctly finish the
initialisation of the plugins. `run_once` can't be called twice so it's
ok to do it there
# Objective
I was trying to add some `Diagnostics` to have a better break down of
performance but I noticed that the current implementation uses a
`ResMut` which forces the functions to all run sequentially whereas
before they could run in parallel. This created too great a performance
penalty to be usable.
## Solution
This PR reworks how the diagnostics work with a couple of breaking
changes. The idea is to change how `Diagnostics` works by changing it to
a `SystemParam`. This allows us to hold a `Deferred` buffer of
measurements that can be applied later, avoiding the need for multiple
mutable references to the hashmap. This means we can run systems that
write diagnostic measurements in parallel.
Firstly, we rename the old `Diagnostics` to `DiagnosticsStore`. This
clears up the original name for the new interface while allowing us to
preserve more closely the original API.
Then we create a new `Diagnostics` struct which implements `SystemParam`
and contains a deferred `SystemBuffer`. This can be used very similar to
the old `Diagnostics` for writing new measurements.
```rust
fn system(diagnostics: ResMut<Diagnostics>) { diagnostics.new_measurement(ID, || 10.0)}
// changes to
fn system(mut diagnostics: Diagnostics) { diagnostics.new_measurement(ID, || 10.0)}
```
For reading the diagnostics, the user needs to change from `Diagnostics`
to `DiagnosticsStore` but otherwise the function calls are the same.
Finally, we add a new method to the `App` for registering diagnostics.
This replaces the old method of creating a startup system and adding it
manually.
Testing it, this PR does indeed allow Diagnostic systems to be run in
parallel.
## Changelog
- Change `Diagnostics` to implement `SystemParam` which allows
diagnostic systems to run in parallel.
## Migration Guide
- Register `Diagnostic`'s using the new
`app.register_diagnostic(Diagnostic::new(DIAGNOSTIC_ID,
"diagnostic_name", 10));`
- In systems for writing new measurements, change `mut diagnostics:
ResMut<Diagnostics>` to `mut diagnostics: Diagnostics` to allow the
systems to run in parallel.
- In systems for reading measurements, change `diagnostics:
Res<Diagnostics>` to `diagnostics: Res<DiagnosticsStore>`.
# Objective
- Introduce a stable alternative to
[`std::any::type_name`](https://doc.rust-lang.org/std/any/fn.type_name.html).
- Rewrite of #5805 with heavy inspiration in design.
- On the path to #5830.
- Part of solving #3327.
## Solution
- Add a `TypePath` trait for static stable type path/name information.
- Add a `TypePath` derive macro.
- Add a `impl_type_path` macro for implementing internal and foreign
types in `bevy_reflect`.
---
## Changelog
- Added `TypePath` trait.
- Added `DynamicTypePath` trait and `get_type_path` method to `Reflect`.
- Added a `TypePath` derive macro.
- Added a `bevy_reflect::impl_type_path` for implementing `TypePath` on
internal and foreign types in `bevy_reflect`.
- Changed `bevy_reflect::utility::(Non)GenericTypeInfoCell` to
`(Non)GenericTypedCell<T>` which allows us to be generic over both
`TypeInfo` and `TypePath`.
- `TypePath` is now a supertrait of `Asset`, `Material` and
`Material2d`.
- `impl_reflect_struct` needs a `#[type_path = "..."]` attribute to be
specified.
- `impl_reflect_value` needs to either specify path starting with a
double colon (`::core::option::Option`) or an `in my_crate::foo`
declaration.
- Added `bevy_reflect_derive::ReflectTypePath`.
- Most uses of `Ident` in `bevy_reflect_derive` changed to use
`ReflectTypePath`.
## Migration Guide
- Implementors of `Asset`, `Material` and `Material2d` now also need to
derive `TypePath`.
- Manual implementors of `Reflect` will need to implement the new
`get_type_path` method.
## Open Questions
- [x] ~This PR currently does not migrate any usages of
`std::any::type_name` to use `bevy_reflect::TypePath` to ease the review
process. Should it?~ Migration will be left to a follow-up PR.
- [ ] This PR adds a lot of `#[derive(TypePath)]` and `T: TypePath` to
satisfy new bounds, mostly when deriving `TypeUuid`. Should we make
`TypePath` a supertrait of `TypeUuid`? [Should we remove `TypeUuid` in
favour of
`TypePath`?](2afbd85532 (r961067892))
# Objective
- Continue with #8685 to make `TonyMcMapface` the default tonemapping
## Solution
- Change the default value `Camera3dBundle::tonemapping` from
`Tonemapping::ReinhardLuminance` to `Default::default()`
(`Tonemapping::TonyMcMapface`)
# Objective
- `apply_system_buffers` is an unhelpful name: it introduces a new
internal-only concept
- this is particularly rough for beginners as reasoning about how
commands work is a critical stumbling block
## Solution
- rename `apply_system_buffers` to the more descriptive `apply_deferred`
- rename related fields, arguments and methods in the internals fo
bevy_ecs for consistency
- update the docs
## Changelog
`apply_system_buffers` has been renamed to `apply_deferred`, to more
clearly communicate its intent and relation to `Deferred` system
parameters like `Commands`.
## Migration Guide
- `apply_system_buffers` has been renamed to `apply_deferred`
- the `apply_system_buffers` method on the `System` trait has been
renamed to `apply_deferred`
- the `is_apply_system_buffers` function has been replaced by
`is_apply_deferred`
- `Executor::set_apply_final_buffers` is now
`Executor::set_apply_final_deferred`
- `Schedule::apply_system_buffers` is now `Schedule::apply_deferred`
---------
Co-authored-by: JoJoJet <21144246+JoJoJet@users.noreply.github.com>
# Objective
Fixes#8596
## Solution
Change interface of the trait Map. Adjust implementations of this trait
---
## Changelog
### Changed
- Interface of Map trait
### Added
- `Map::get_at_mut`
## Migration Guide
Every implementor of Map trait would need to implement `get_at_mut`.
Which, judging by changes in this PR, should be fairly trivial.
- Supress false positive `redundant_clone` lints.
- Supress inactionable `result_large_err` lint.
Most of the size(50 out of 68 bytes) is coming from
`naga::WithSpan<naga::valid::ValidationError>`
# Objective
- Make the dependency job successful again
## Solution
- Update the list of duplicates
- Remove a security issue exception not needed anymore
- Also update a dependency that was missed by dependabot
# Objective
Right now it's impossible to construct a MapIter outside of the
bevy_reflect crate, making it impossible to implement the Map trait for
custom map types.
## Solution
Addition of a pub constructor to MapIter.
Updates the requirements on
[android_log-sys](https://github.com/nercury/android_log-sys-rs) to
permit the latest version.
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a
href="https://github.com/nercury/android_log-sys-rs/commits">compare
view</a></li>
</ul>
</details>
<br />
You can trigger a rebase of this PR by commenting `@dependabot rebase`.
[//]: # (dependabot-automerge-start)
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---
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<summary>Dependabot commands and options</summary>
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# Objective
- Showcase the use of `or_else()` as requested. Fixes
https://github.com/bevyengine/bevy/issues/8702
## Solution
- Add an uninitialized resource `Unused`
- Use `or_else()` to evaluate a second run condition
- Add documentation explaining how `or_else()` works
# Objective
The `Condition` trait is only implemented for systems and system
functions that take no input. This can make it awkward to write
conditions that are intended to be used with system piping.
## Solution
Add an `In` generic to the trait. It defaults to `()`.
---
## Changelog
- Made the `Condition` trait generic over system inputs.
# Objective
- Fix Wayland window client side decorations issue on Gnome Wayland,
fixes#3301.
## Solution
- One simple one line solution: Add winit's `wayland-csd-adwaita`
feature to Bevy's `wayland` feature.
Copied from
https://github.com/bevyengine/bevy/issues/3301#issuecomment-1569611257:
### Investigation
1. Gnome forced Wayland apps to implement CSD, whether on their own or
using some libraries like Gnome's official solution
[libdecor](https://gitlab.freedesktop.org/libdecor/libdecor). Many Linux
apps do this with libdecor, like blender, kitty... I think it's not
comfortable for Bevy to fix this problem this way.
2. Winit has support for CSD on
wayland(8bb004a1d9/Cargo.toml (L42)),
but Bevy disabled Winit's default features, thus no winit's
`wayland-csd-adwaita` feature. And Bevy's `wayland` feature doesn't
include winit's `wayland-csd-adwaita` feature so users can't get window
decorations on Wayland even with Bevy's `wayland` feature enabled.
3. Many rust UI toolkit, like iced, doesn't disable winit's
`wayland-csd-adwaita` feature.
### Conclusion and one Possible solution
Bevy disabled `winit`'s default features in order to decrease package
size. But I think it's acceptable to add `winit`'s `wayland-csd-adwaita`
feature to Bevy's `wayland` feature gate to fix this issue easily for
this only add on crate: sctk-adwaita.
