avoid setting duplicate cursor image

Reference: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3436
Based on: https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/3595

dwl.c

@@ -298,6 +298,7 @@ static void zoom(const Arg *arg);
 
 /* variables */
 static const char broken[] = "broken";
+static const char *cursor_image = "left_ptr";
 static pid_t child_pid = -1;
 static void *exclusive_focus;
 static struct wl_display *dpy;
@@ -674,10 +675,13 @@ buttonpress(struct wl_listener *listener, void *data)
 		break;
 	case WLR_BUTTON_RELEASED:
 		/* If you released any buttons, we exit interactive move/resize mode. */
-		/* TODO should reset to the pointer focus's current setcursor */
 		if (cursor_mode != CurNormal) {
-			wlr_xcursor_manager_set_cursor_image(cursor_mgr, "left_ptr", cursor);
 			cursor_mode = CurNormal;
+			/* Clear the pointer focus, this way if the cursor is over a surface
+			 * we will send an enter event after which the client will provide us
+			 * a cursor surface */
+			wlr_seat_pointer_clear_focus(seat);
+			motionnotify(0);
 			/* Drop the window off on its new monitor */
 			selmon = xytomon(cursor->x, cursor->y);
 			setmon(grabc, selmon, 0);
@@ -1531,8 +1535,8 @@ motionnotify(uint32_t time)
 	/* If there's no client surface under the cursor, set the cursor image to a
 	 * default. This is what makes the cursor image appear when you move it
 	 * off of a client or over its border. */
-	if (!surface)
-		wlr_xcursor_manager_set_cursor_image(cursor_mgr, "left_ptr", cursor);
+	if (!surface && (!cursor_image || strcmp(cursor_image, "left_ptr")))
+		wlr_xcursor_manager_set_cursor_image(cursor_mgr, (cursor_image = "left_ptr"), cursor);
 
 	pointerfocus(c, surface, sx, sy, time);
 }
@@ -1567,7 +1571,7 @@ moveresize(const Arg *arg)
 	case CurMove:
 		grabcx = cursor->x - grabc->geom.x;
 		grabcy = cursor->y - grabc->geom.y;
-		wlr_xcursor_manager_set_cursor_image(cursor_mgr, "fleur", cursor);
+		wlr_xcursor_manager_set_cursor_image(cursor_mgr, (cursor_image = "fleur"), cursor);
 		break;
 	case CurResize:
 		/* Doesn't work for X11 output - the next absolute motion event
@@ -1576,7 +1580,7 @@ moveresize(const Arg *arg)
 				grabc->geom.x + grabc->geom.width,
 				grabc->geom.y + grabc->geom.height);
 		wlr_xcursor_manager_set_cursor_image(cursor_mgr,
-				"bottom_right_corner", cursor);
+				(cursor_image = "bottom_right_corner"), cursor);
 		break;
 	}
 }
@@ -1702,7 +1706,6 @@ pointerfocus(Client *c, struct wlr_surface *surface, double sx, double sy,
 	 * wlroots makes this a no-op if surface is already focused */
 	wlr_seat_pointer_notify_enter(seat, surface, sx, sy);
 	wlr_seat_pointer_notify_motion(seat, time, sx, sy);
-
 }
 
 void
@@ -1867,7 +1870,7 @@ run(char *startup_cmd)
 	 * initialized, as the image/coordinates are not transformed for the
 	 * monitor when displayed here */
 	wlr_cursor_warp_closest(cursor, NULL, cursor->x, cursor->y);
-	wlr_xcursor_manager_set_cursor_image(cursor_mgr, "left_ptr", cursor);
+	wlr_xcursor_manager_set_cursor_image(cursor_mgr, cursor_image, cursor);
 
 	/* Run the Wayland event loop. This does not return until you exit the
 	 * compositor. Starting the backend rigged up all of the necessary event
@@ -1890,10 +1893,12 @@ setcursor(struct wl_listener *listener, void *data)
 {
 	/* This event is raised by the seat when a client provides a cursor image */
 	struct wlr_seat_pointer_request_set_cursor_event *event = data;
-	/* If we're "grabbing" the cursor, don't use the client's image */
-	/* TODO still need to save the provided surface to restore later */
+	/* If we're "grabbing" the cursor, don't use the client's image, we will
+	 * restore it after "grabbing" sending a leave event, followed by a enter
+	 * event, which will result in the client requesting set the cursor surface */
 	if (cursor_mode != CurNormal)
 		return;
+	cursor_image = NULL;
 	/* This can be sent by any client, so we check to make sure this one is
 	 * actually has pointer focus first. If so, we can tell the cursor to
 	 * use the provided surface as the cursor image. It will set the