Add forward-char-passive binding

This binding is akin to ForwardSingleChar but it is "passive" in that is not
intended to affect the meta state of the shell: autocompletions are not accepted
if the cursor is at the end of input and it does not have any effect in the
completions pager.

src/input.rs

@@ -153,6 +153,7 @@ const INPUT_FUNCTION_METADATA: &[InputFunctionMetadata] = &[
     make_md(L!("force-repaint"), ReadlineCmd::ForceRepaint),
     make_md(L!("forward-bigword"), ReadlineCmd::ForwardBigword),
     make_md(L!("forward-char"), ReadlineCmd::ForwardChar),
+    make_md(L!("forward-char-passive"), ReadlineCmd::ForwardCharPassive),
     make_md(L!("forward-jump"), ReadlineCmd::ForwardJump),
     make_md(L!("forward-jump-till"), ReadlineCmd::ForwardJumpTill),
     make_md(L!("forward-single-char"), ReadlineCmd::ForwardSingleChar),

src/input_common.rs

@@ -35,6 +35,7 @@ pub enum ReadlineCmd {
     ForwardChar,
     BackwardChar,
     ForwardSingleChar,
+    ForwardCharPassive,
     ForwardWord,
     BackwardWord,
     ForwardBigword,

src/reader.rs

@@ -2511,6 +2511,16 @@ impl ReaderData {
                     self.update_buff_pos(elt, Some(el.position() + 1));
                 }
             }
+            rl::ForwardCharPassive => {
+                let (elt, el) = self.active_edit_line();
+                if self.is_navigating_pager_contents() {
+                    // Do nothing
+                } else if self.is_at_end(el) {
+                    // Do nothing
+                } else {
+                    self.update_buff_pos(elt, Some(el.position() + 1));
+                }
+            }
             rl::BackwardKillWord | rl::BackwardKillPathComponent | rl::BackwardKillBigword => {
                 let style = match c {
                     rl::BackwardKillBigword => MoveWordStyle::Whitespace,
@@ -4495,6 +4505,7 @@ fn command_ends_paging(c: ReadlineCmd, focused_on_search_field: bool) -> bool {
         | rl::HistoryPager
         | rl::BackwardChar
         | rl::ForwardChar
+        | rl::ForwardCharPassive
         | rl::ForwardSingleChar
         | rl::UpLine
         | rl::DownLine