input: Allow Escape to cancel grabs

src/config/key_bindings.rs

@@ -143,6 +143,8 @@ pub enum Action {
     Terminate,
     Debug,
     Close,
+    #[serde(skip)]
+    Escape,
 
     Workspace(u8),
     NextWorkspace,
@@ -317,4 +319,11 @@ pub fn add_default_bindings(
         output_next.iter().copied(),
         Action::MoveToOutput(output_next_dir),
     );
+
+    insert_binding(
+        key_bindings,
+        KeyModifiers::default(),
+        std::iter::once(Keysym::Escape),
+        Action::Escape,
+    );
 }

src/input/mod.rs

@@ -1197,6 +1197,24 @@ impl State {
                     window.send_close();
                 }
             }
+            Action::Escape => {
+                self.common
+                    .shell
+                    .set_overview_mode(None, self.common.event_loop_handle.clone());
+                self.common.shell.set_resize_mode(
+                    None,
+                    &self.common.config,
+                    self.common.event_loop_handle.clone(),
+                );
+                let pointer = seat.get_pointer().unwrap();
+                let keyboard = seat.get_keyboard().unwrap();
+                if pointer.is_grabbed() {
+                    pointer.unset_grab(self, serial, time);
+                }
+                if keyboard.is_grabbed() {
+                    keyboard.unset_grab();
+                }
+            }
             Action::Workspace(key_num) => {
                 let current_output = seat.active_output();
                 let workspace = match key_num {