wayland: committing resized buffer is delayed

[vyivel]

As far as I understand, this is what happens on window resize:

1. A compositor sends a configure event, saving its serial number and waiting.
2. imv receives the event and calls wl_egl_window_resize(). However, this call has no effect yet, as eglSwapBuffers() hasn't been called.
3. imv pushes a resize event to its own event queue.
4. imv acks the configure with the old buffer size.
5. The compositor receives an ack_configure request with the saved serial number, but imv's size wasn't updated.
6. imv handles its own resize event, redraws, calls eglSwapBuffers() and commits a new buffer with a new size.
7. The compositor receives a commit with an unexpected size change.

Instead, imv should redraw right after calling wl_egl_window_resize(). Calling eglSwapBuffers() in toplevel_configure() fixes the problem, while unsurprisingly introducing rendering issues.

[vyivel]

Nevermind, this issue seems to be present with every(?) program that uses EGL for rendering (e.g. weston-simple-egl).