fix: route pane focus bindings past the file explorer

docs/editing.md

@@ -199,6 +199,8 @@ Closing a pane gives its space to its sibling:
 
 There is no default close-pane binding. Option must send Alt/Meta in the terminal; on macOS, configure the terminal's Option-key behavior if it instead produces special characters. These bindings do not replace existing Ctrl+j or uppercase motion/edit bindings.
 
+Pane-focus bindings also work while the ordinary file explorer or picker has focus. Moving to a neighboring pane returns keyboard focus to its document; a floating picker closes, while a docked explorer remains visible. Explicit `tree` or `selection` navigation overrides and disabled keys take precedence over pane-focus bindings.
+
 Diff comparisons reuse the split geometry and directional-focus engine. Option/Alt navigation moves between Before, After, and Files first, then to a neighboring workspace pane when there is no internal target in that direction. Splitting a diff text view creates an ordinary sibling showing the same buffer; historical snapshots remain read-only, including after the comparison closes.
 
 ## Buffers

src/editor.rs

@@ -1662,6 +1662,9 @@ impl Editor {
             .neighbor(self.pane_id, direction, self.pane_bounds)
         {
             self.finish_pane_interaction();
+            if self.diff.is_none() {
+                self.blur_file_picker();
+            }
             self.select_pane(id);
             if self.active.view.mode == Mode::Insert {
                 self.begin_insert();
@@ -4260,6 +4263,28 @@ impl Editor {
         if (picker_focused || self.palette.is_some()) && self.handle_selection_binding(&input) {
             return None;
         }
+        if picker_focused
+            && let Some(Binding::Action(action)) =
+                self.bindings.get(&mode).and_then(|keys| keys.get(&input))
+            && matches!(
+                action,
+                Action::PaneFocusLeft
+                    | Action::PaneFocusDown
+                    | Action::PaneFocusUp
+                    | Action::PaneFocusRight
+            )
+        {
+            let action = *action;
+            if self
+                .file_picker
+                .as_mut()
+                .expect("focused picker exists")
+                .handle_filter_input(&input)
+            {
+                return None;
+            }
+            return self.act(action);
+        }
         if picker_focused {
             self.handle_file_picker(input);
             return None;
@@ -8040,6 +8065,65 @@ mod tests {
         }
     }
 
+    #[test]
+    fn pane_focus_remaps_do_not_steal_printable_picker_filter_input() {
+        let directory = Directory::new();
+        fs::write(directory.path("hello.txt"), "alpha").unwrap();
+        let mut editor = editor();
+        editor.project_root = directory.0.clone();
+        editor.handle(Input::Char('|'));
+        editor
+            .bind("normal", "h", Some("core.pane.focus_left".into()))
+            .unwrap();
+        editor.open_file_picker(FilePresentation::Floating);
+        editor.handle(Input::Char('h'));
+        assert_eq!(editor.pane_id(), 2);
+        assert_eq!(editor.file_picker().unwrap().query, "h");
+    }
+
+    #[test]
+    fn pane_focus_bindings_escape_focused_explorer_without_changing_documents() {
+        let directory = Directory::new();
+        fs::write(directory.path("a.txt"), "alpha").unwrap();
+        fs::write(directory.path("b.txt"), "beta").unwrap();
+        let mut editor = editor();
+        editor.project_root = directory.0.clone();
+        editor.handle(Input::Char('|'));
+        editor.handle(Input::Char('_'));
+        let original = editor.lines().to_vec();
+        for (key, pane) in [('k', 2), ('h', 1), ('l', 2), ('j', 3)] {
+            editor.open_file_picker(FilePresentation::Docked);
+            assert!(editor.file_picker().unwrap().focused);
+            editor.handle(Input::Alt(key));
+            assert_eq!(editor.pane_id(), pane);
+            assert!(!editor.file_picker().unwrap().focused);
+            assert_eq!(editor.lines(), original);
+        }
+    }
+
+    #[test]
+    fn explorer_navigation_overrides_take_precedence_over_pane_focus() {
+        for context in ["tree", "selection"] {
+            for target in [None, Some("core.down")] {
+                let directory = Directory::new();
+                fs::write(directory.path("a.txt"), "alpha").unwrap();
+                fs::write(directory.path("b.txt"), "beta").unwrap();
+                let mut editor = editor();
+                editor.project_root = directory.0.clone();
+                editor.handle(Input::Char('|'));
+                editor
+                    .bind(context, "alt+h", target.map(str::to_owned))
+                    .unwrap();
+                editor.open_file_picker(FilePresentation::Docked);
+                editor.handle(Input::Alt('h'));
+                assert_eq!(editor.pane_id(), 2);
+                let picker = editor.file_picker().unwrap();
+                assert!(picker.focused);
+                assert_eq!(picker.selected, usize::from(target.is_some()));
+            }
+        }
+    }
+
     #[test]
     fn nested_panes_inherit_views_and_focus_geometrically_without_touching_ctrl_j() {
         let mut editor = editor();