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ickshonpe 8545580214 text aspect ratio bug fix (#6825) 
## Objective 

Bevy UI uses a `MeasureFunc` that preserves the aspect ratio of text, not just images. This means that the extent of flex-items containing text may be calculated incorrectly depending on the ratio of the text size compared to the size of its containing node.

Fixes #6748 
Related to #6724

with Bevy 0.9:

![Capture_cols_0 9](https://user-images.githubusercontent.com/27962798/205435999-386d3400-fe9b-475a-aab1-18e61c4c074f.PNG)

with this PR (accurately matching the behavior of Flexbox):

![Capture_fixed](https://user-images.githubusercontent.com/27962798/205436005-6bafbcc2-cd87-4eb7-b5c6-9dbcb30fc795.PNG)

## Solution
Only perform the aspect ratio calculations if the uinode contains an image.

## Changelog
* Added a field `preserve_aspect_ratio` to `CalculatedSize`
* The `MeasureFunc` only preserves the aspect ratio when `preserve_aspect_ratio` is true.
* `update_image_calculated_size_system` sets `preserve_aspect_ratio` to true for nodes with images.
2022-12-20 16:44:12 +00:00
..
src text aspect ratio bug fix (#6825) 2022-12-20 16:44:12 +00:00
Cargo.toml Release 0.9.0 (#6568) 2022-11-12 20:01:29 +00:00