linux: Fix IME panel position while enumerating input methods (#12495)

Release Notes:

- N/A

This updates the IME position every time the selection changes, this is
probably only useful when you enumerate languages with your IME.

TODO:
- ~There is a rare chance that the ime panel is not updated because the
window input handler is None.~
- ~Update IME panel in vim mode.~
- ~Update IME panel when leaving Buffer search input.~

---------

Co-authored-by: Mikayla Maki <mikayla@zed.dev>

crates/editor/src/editor.rs

@@ -76,8 +76,8 @@ use gpui::{
     FocusOutEvent, FocusableView, FontId, FontWeight, HighlightStyle, Hsla, InteractiveText,
     KeyContext, ListSizingBehavior, Model, MouseButton, PaintQuad, ParentElement, Pixels, Render,
     SharedString, Size, StrikethroughStyle, Styled, StyledText, Subscription, Task, TextStyle,
-    UnderlineStyle, UniformListScrollHandle, View, ViewContext, ViewInputHandler, VisualContext,
-    WeakFocusHandle, WeakView, WindowContext,
+    UTF16Selection, UnderlineStyle, UniformListScrollHandle, View, ViewContext, ViewInputHandler,
+    VisualContext, WeakFocusHandle, WeakView, WindowContext,
 };
 use highlight_matching_bracket::refresh_matching_bracket_highlights;
 use hover_popover::{hide_hover, HoverState};
@@ -2365,6 +2365,8 @@ impl Editor {
         show_completions: bool,
         cx: &mut ViewContext<Self>,
     ) {
+        cx.invalidate_character_coordinates();
+
         // Copy selections to primary selection buffer
         #[cfg(target_os = "linux")]
         if local {
@@ -11839,12 +11841,12 @@ impl Editor {
 
         let snapshot = buffer.read(cx).snapshot();
         let range = self
-            .selected_text_range(cx)
-            .and_then(|selected_range| {
-                if selected_range.is_empty() {
+            .selected_text_range(false, cx)
+            .and_then(|selection| {
+                if selection.range.is_empty() {
                     None
                 } else {
-                    Some(selected_range)
+                    Some(selection.range)
                 }
             })
             .unwrap_or_else(|| 0..snapshot.len());
@@ -12796,15 +12798,24 @@ impl ViewInputHandler for Editor {
         )
     }
 
-    fn selected_text_range(&mut self, cx: &mut ViewContext<Self>) -> Option<Range<usize>> {
+    fn selected_text_range(
+        &mut self,
+        ignore_disabled_input: bool,
+        cx: &mut ViewContext<Self>,
+    ) -> Option<UTF16Selection> {
         // Prevent the IME menu from appearing when holding down an alphabetic key
         // while input is disabled.
-        if !self.input_enabled {
+        if !ignore_disabled_input && !self.input_enabled {
             return None;
         }
 
-        let range = self.selections.newest::<OffsetUtf16>(cx).range();
-        Some(range.start.0..range.end.0)
+        let selection = self.selections.newest::<OffsetUtf16>(cx);
+        let range = selection.range();
+
+        Some(UTF16Selection {
+            range: range.start.0..range.end.0,
+            reversed: selection.reversed,
+        })
     }
 
     fn marked_text_range(&self, cx: &mut ViewContext<Self>) -> Option<Range<usize>> {