linux: Fix IME preedit text not showing in Terminal on Wayland (#37701)

Closes https://github.com/zed-industries/zed/issues/37268
 
Release Notes:

- Fixed an issue where IME preedit text was not showing in the Terminal
on Wayland.

crates/terminal_view/src/terminal_element.rs

@@ -1192,8 +1192,8 @@ impl Element for TerminalElement {
                 bounds.origin + Point::new(layout.gutter, px(0.)) - Point::new(px(0.), scroll_top);
 
             let marked_text_cloned: Option<String> = {
-                let ime_state = self.terminal_view.read(cx);
-                ime_state.marked_text.clone()
+                let ime_state = &self.terminal_view.read(cx).ime_state;
+                ime_state.as_ref().map(|state| state.marked_text.clone())
             };
 
             let terminal_input_handler = TerminalInputHandler {
@@ -1421,11 +1421,9 @@ impl InputHandler for TerminalInputHandler {
         _window: &mut Window,
         cx: &mut App,
     ) {
-        if let Some(range) = new_marked_range {
-            self.terminal_view.update(cx, |view, view_cx| {
-                view.set_marked_text(new_text.to_string(), range, view_cx);
-            });
-        }
+        self.terminal_view.update(cx, |view, view_cx| {
+            view.set_marked_text(new_text.to_string(), new_marked_range, view_cx);
+        });
     }
 
     fn unmark_text(&mut self, _window: &mut Window, cx: &mut App) {

crates/terminal_view/src/terminal_view.rs

@@ -62,6 +62,11 @@ use std::{
     time::Duration,
 };
 
+struct ImeState {
+    marked_text: String,
+    marked_range_utf16: Option<Range<usize>>,
+}
+
 const CURSOR_BLINK_INTERVAL: Duration = Duration::from_millis(500);
 const TERMINAL_SCROLLBAR_WIDTH: Pixels = px(12.);
 
@@ -138,8 +143,7 @@ pub struct TerminalView {
     scroll_handle: TerminalScrollHandle,
     show_scrollbar: bool,
     hide_scrollbar_task: Option<Task<()>>,
-    marked_text: Option<String>,
-    marked_range_utf16: Option<Range<usize>>,
+    ime_state: Option<ImeState>,
     _subscriptions: Vec<Subscription>,
     _terminal_subscriptions: Vec<Subscription>,
 }
@@ -263,8 +267,7 @@ impl TerminalView {
             show_scrollbar: !Self::should_autohide_scrollbar(cx),
             hide_scrollbar_task: None,
             cwd_serialized: false,
-            marked_text: None,
-            marked_range_utf16: None,
+            ime_state: None,
             _subscriptions: vec![
                 focus_in,
                 focus_out,
@@ -323,24 +326,27 @@ impl TerminalView {
     pub(crate) fn set_marked_text(
         &mut self,
         text: String,
-        range: Range<usize>,
+        range: Option<Range<usize>>,
         cx: &mut Context<Self>,
     ) {
-        self.marked_text = Some(text);
-        self.marked_range_utf16 = Some(range);
+        self.ime_state = Some(ImeState {
+            marked_text: text,
+            marked_range_utf16: range,
+        });
         cx.notify();
     }
 
     /// Gets the current marked range (UTF-16).
     pub(crate) fn marked_text_range(&self) -> Option<Range<usize>> {
-        self.marked_range_utf16.clone()
+        self.ime_state
+            .as_ref()
+            .and_then(|state| state.marked_range_utf16.clone())
     }
 
     /// Clears the marked (pre-edit) text state.
     pub(crate) fn clear_marked_text(&mut self, cx: &mut Context<Self>) {
-        if self.marked_text.is_some() {
-            self.marked_text = None;
-            self.marked_range_utf16 = None;
+        if self.ime_state.is_some() {
+            self.ime_state = None;
             cx.notify();
         }
     }