editor: Skip stop_at_indent for single-line editors (#50681)

In single-line editors like the Find bar, MoveToBeginningOfLine with
stop_at_indent should go directly to column 0 instead of stopping at the
indentation level.

Closes #50634

Before you mark this PR as ready for review, make sure that you have:
- [x] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [ ] Aligned any UI changes with the [UI
checklist](https://github.com/zedindustries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- Fixed `MoveToBeginningOfLine` stopping at indentation in single-line
editors like the Find bar instead of moving to column 0.

crates/editor/src/editor.rs

@@ -14703,6 +14703,7 @@ impl Editor {
         window: &mut Window,
         cx: &mut Context<Self>,
     ) {
+        let stop_at_indent = action.stop_at_indent && !self.mode.is_single_line();
         self.hide_mouse_cursor(HideMouseCursorOrigin::MovementAction, cx);
         self.change_selections(Default::default(), window, cx, |s| {
             s.move_cursors_with(&mut |map, head, _| {
@@ -14711,7 +14712,7 @@ impl Editor {
                         map,
                         head,
                         action.stop_at_soft_wraps,
-                        action.stop_at_indent,
+                        stop_at_indent,
                     ),
                     SelectionGoal::None,
                 )
@@ -14725,6 +14726,7 @@ impl Editor {
         window: &mut Window,
         cx: &mut Context<Self>,
     ) {
+        let stop_at_indent = action.stop_at_indent && !self.mode.is_single_line();
         self.hide_mouse_cursor(HideMouseCursorOrigin::MovementAction, cx);
         self.change_selections(Default::default(), window, cx, |s| {
             s.move_heads_with(&mut |map, head, _| {
@@ -14733,7 +14735,7 @@ impl Editor {
                         map,
                         head,
                         action.stop_at_soft_wraps,
-                        action.stop_at_indent,
+                        stop_at_indent,
                     ),
                     SelectionGoal::None,
                 )

crates/editor/src/editor_tests.rs

@@ -1868,6 +1868,56 @@ fn test_beginning_end_of_line(cx: &mut TestAppContext) {
     });
 }
 
+#[gpui::test]
+fn test_beginning_of_line_single_line_editor(cx: &mut TestAppContext) {
+    init_test(cx, |_| {});
+
+    let editor = cx.add_window(|window, cx| Editor::single_line(window, cx));
+
+    _ = editor.update(cx, |editor, window, cx| {
+        editor.set_text("  indented text", window, cx);
+        editor.change_selections(SelectionEffects::no_scroll(), window, cx, |s| {
+            s.select_display_ranges([
+                DisplayPoint::new(DisplayRow(0), 10)..DisplayPoint::new(DisplayRow(0), 10)
+            ]);
+        });
+
+        editor.move_to_beginning_of_line(
+            &MoveToBeginningOfLine {
+                stop_at_soft_wraps: true,
+                stop_at_indent: true,
+            },
+            window,
+            cx,
+        );
+        assert_eq!(
+            display_ranges(editor, cx),
+            &[DisplayPoint::new(DisplayRow(0), 0)..DisplayPoint::new(DisplayRow(0), 0)]
+        );
+    });
+
+    _ = editor.update(cx, |editor, window, cx| {
+        editor.change_selections(SelectionEffects::no_scroll(), window, cx, |s| {
+            s.select_display_ranges([
+                DisplayPoint::new(DisplayRow(0), 10)..DisplayPoint::new(DisplayRow(0), 10)
+            ]);
+        });
+
+        editor.select_to_beginning_of_line(
+            &SelectToBeginningOfLine {
+                stop_at_soft_wraps: true,
+                stop_at_indent: true,
+            },
+            window,
+            cx,
+        );
+        assert_eq!(
+            display_ranges(editor, cx),
+            &[DisplayPoint::new(DisplayRow(0), 10)..DisplayPoint::new(DisplayRow(0), 0)]
+        );
+    });
+}
+
 #[gpui::test]
 fn test_beginning_end_of_line_ignore_soft_wrap(cx: &mut TestAppContext) {
     init_test(cx, |_| {});