Wayland: Avoid recreating input objects on capability change

Before, multiple capability events would instantiate the same object
over and over as long as its bit was set. This caused issues with
hotplug and device suspension.

platform/linuxbsd/wayland/wayland_thread.cpp

@@ -1263,23 +1263,25 @@ void WaylandThread::_wl_seat_on_capabilities(void *data, struct wl_seat *wl_seat
 
 	// Pointer handling.
 	if (capabilities & WL_SEAT_CAPABILITY_POINTER) {
-		ss->cursor_surface = wl_compositor_create_surface(ss->registry->wl_compositor);
-		wl_surface_commit(ss->cursor_surface);
+		if (!ss->wl_pointer) {
+			ss->cursor_surface = wl_compositor_create_surface(ss->registry->wl_compositor);
+			wl_surface_commit(ss->cursor_surface);
 
-		ss->wl_pointer = wl_seat_get_pointer(wl_seat);
-		wl_pointer_add_listener(ss->wl_pointer, &wl_pointer_listener, ss);
+			ss->wl_pointer = wl_seat_get_pointer(wl_seat);
+			wl_pointer_add_listener(ss->wl_pointer, &wl_pointer_listener, ss);
 
-		if (ss->registry->wp_relative_pointer_manager) {
-			ss->wp_relative_pointer = zwp_relative_pointer_manager_v1_get_relative_pointer(ss->registry->wp_relative_pointer_manager, ss->wl_pointer);
-			zwp_relative_pointer_v1_add_listener(ss->wp_relative_pointer, &wp_relative_pointer_listener, ss);
-		}
+			if (ss->registry->wp_relative_pointer_manager) {
+				ss->wp_relative_pointer = zwp_relative_pointer_manager_v1_get_relative_pointer(ss->registry->wp_relative_pointer_manager, ss->wl_pointer);
+				zwp_relative_pointer_v1_add_listener(ss->wp_relative_pointer, &wp_relative_pointer_listener, ss);
+			}
 
-		if (ss->registry->wp_pointer_gestures) {
-			ss->wp_pointer_gesture_pinch = zwp_pointer_gestures_v1_get_pinch_gesture(ss->registry->wp_pointer_gestures, ss->wl_pointer);
-			zwp_pointer_gesture_pinch_v1_add_listener(ss->wp_pointer_gesture_pinch, &wp_pointer_gesture_pinch_listener, ss);
-		}
+			if (ss->registry->wp_pointer_gestures) {
+				ss->wp_pointer_gesture_pinch = zwp_pointer_gestures_v1_get_pinch_gesture(ss->registry->wp_pointer_gestures, ss->wl_pointer);
+				zwp_pointer_gesture_pinch_v1_add_listener(ss->wp_pointer_gesture_pinch, &wp_pointer_gesture_pinch_listener, ss);
+			}
 
-		// TODO: Constrain new pointers if the global mouse mode is constrained.
+			// TODO: Constrain new pointers if the global mouse mode is constrained.
+		}
 	} else {
 		if (ss->cursor_frame_callback) {
 			// Just in case. I got bitten by weird race-like conditions already.
@@ -1317,11 +1319,13 @@ void WaylandThread::_wl_seat_on_capabilities(void *data, struct wl_seat *wl_seat
 
 	// Keyboard handling.
 	if (capabilities & WL_SEAT_CAPABILITY_KEYBOARD) {
-		ss->xkb_context = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
-		ERR_FAIL_NULL(ss->xkb_context);
+		if (!ss->wl_keyboard) {
+			ss->xkb_context = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
+			ERR_FAIL_NULL(ss->xkb_context);
 
-		ss->wl_keyboard = wl_seat_get_keyboard(wl_seat);
-		wl_keyboard_add_listener(ss->wl_keyboard, &wl_keyboard_listener, ss);
+			ss->wl_keyboard = wl_seat_get_keyboard(wl_seat);
+			wl_keyboard_add_listener(ss->wl_keyboard, &wl_keyboard_listener, ss);
+		}
 	} else {
 		if (ss->xkb_context) {
 			xkb_context_unref(ss->xkb_context);