compositor-x11: Grab pointer on button press, ungrab on release

This lets us confine the X pointer to the Weston X window, which corresponds
better with the rendered Wayland cursor actually moves.

https://bugs.freedesktop.org/show_bug.cgi?id=53558

diff --git a/src/compositor-x11.c b/src/compositor-x11.c
index 22514c9..71287e0 100644 (file)
--- a/src/compositor-x11.c
+++ b/src/compositor-x11.c
@@ -668,6 +668,23 @@ x11_compositor_deliver_button_event(struct x11_compositor *c,
        xcb_button_press_event_t *button_event =
                (xcb_button_press_event_t *) event;
        uint32_t button;
+       struct x11_output *output;
+
+       output = x11_compositor_find_output(c, button_event->event);
+
+       if (state)
+               xcb_grab_pointer(c->conn, 0, output->window,
+                                XCB_EVENT_MASK_BUTTON_PRESS |
+                                XCB_EVENT_MASK_BUTTON_RELEASE |
+                                XCB_EVENT_MASK_POINTER_MOTION |
+                                XCB_EVENT_MASK_ENTER_WINDOW |
+                                XCB_EVENT_MASK_LEAVE_WINDOW,
+                                XCB_GRAB_MODE_ASYNC,
+                                XCB_GRAB_MODE_ASYNC,
+                                output->window, XCB_CURSOR_NONE,
+                                button_event->time);
+       else
+               xcb_ungrab_pointer(c->conn, button_event->time);
 
        if (!c->has_xkb)
                update_xkb_state_from_core(c, button_event->state);