fix: show primary cursor when command prompt is active

When the command prompt (:) is active, the terminal cursor moves to the
prompt line, leaving the primary cursor position in the editor invisible.
This change detects when a prompt component is active and forces the
primary cursor to be drawn manually in the editor while the prompt
is shown.

- Add prompt_active field to EditorView to track prompt state
- Update compositor to detect and communicate prompt state to EditorView
- Modify cursor highlighting logic to force primary cursor drawing when prompt is active
- Maintain real terminal cursor for prompt while showing fake cursor in editor

helix-term/src/compositor.rs

@@ -177,7 +177,14 @@ impl Compositor {
     }
 
     pub fn render(&mut self, area: Rect, surface: &mut Surface, cx: &mut Context) {
+        // Check if there are prompt layers active and update EditorView
+        let has_prompt = self.has_component("helix_term::ui::prompt::Prompt");
+        
         for layer in &mut self.layers {
+            // Update prompt state for EditorView
+            if let Some(editor_view) = layer.as_any_mut().downcast_mut::<crate::ui::EditorView>() {
+                editor_view.prompt_active = has_prompt;
+            }
             layer.render(area, surface, cx);
         }
     }

helix-term/src/ui/editor.rs

@@ -44,6 +44,8 @@ pub struct EditorView {
     spinners: ProgressSpinners,
     /// Tracks if the terminal window is focused by reaction to terminal focus events
     terminal_focused: bool,
+    /// Tracks if there are prompt layers active (updated by compositor)
+    pub prompt_active: bool,
 }
 
 #[derive(Debug, Clone)]
@@ -67,6 +69,7 @@ impl EditorView {
             completion: None,
             spinners: ProgressSpinners::default(),
             terminal_focused: true,
+            prompt_active: false,
         }
     }
 
@@ -133,7 +136,7 @@ impl EditorView {
             if let Some(tabstops) = Self::tabstop_highlights(doc, theme) {
                 overlays.push(tabstops);
             }
-            overlays.push(Self::doc_selection_highlights(
+            overlays.push(self.doc_selection_highlights(
                 editor.mode(),
                 doc,
                 view,
@@ -427,7 +430,8 @@ impl EditorView {
     }
 
     /// Get highlight spans for selections in a document view.
-    pub fn doc_selection_highlights(
+    fn doc_selection_highlights(
+        &self,
         mode: Mode,
         doc: &Document,
         view: &View,
@@ -481,9 +485,9 @@ impl EditorView {
 
             // Special-case: cursor at end of the rope.
             if range.head == range.anchor && range.head == text.len_chars() {
-                if !selection_is_primary || !is_terminal_focused {
-                    // Primary cursor is drawn by the terminal when focused
-                    // Secondary cursors and unfocused primary cursor are drawn manually
+                if !selection_is_primary || !is_terminal_focused || self.prompt_active {
+                    // Primary cursor is drawn by the terminal when focused and no prompt is active
+                    // Secondary cursors, unfocused primary cursor, and editor cursor when prompt is active are drawn manually
                     spans.push((cursor_scope, range.head..range.head + 1));
                 }
                 continue;
@@ -502,16 +506,16 @@ impl EditorView {
                     };
                 spans.push((selection_scope, range.anchor..selection_end));
                 // add cursors
-                // skip primary cursor if terminal is focused - terminal cursor is used in that case
-                if !selection_is_primary || !is_terminal_focused {
+                // skip primary cursor if terminal is focused and no prompt is active - terminal cursor is used in that case
+                if !selection_is_primary || !is_terminal_focused || self.prompt_active {
                     spans.push((cursor_scope, cursor_start..range.head));
                 }
             } else {
                 // Reverse case.
                 let cursor_end = next_grapheme_boundary(text, range.head);
                 // add cursors
-                // skip primary cursor if terminal is focused - terminal cursor is used in that case
-                if !selection_is_primary || !is_terminal_focused {
+                // skip primary cursor if terminal is focused and no prompt is active - terminal cursor is used in that case
+                if !selection_is_primary || !is_terminal_focused || self.prompt_active {
                     spans.push((cursor_scope, range.head..cursor_end));
                 }
                 // non block cursors look like they exclude the cursor