Previously, root ConfigureNotify is handled immediately, by resetting
the backend, which in turn releases all the window images. This puts all
the windows into a state where they don't have images attached, which
they really should be in when the screen is redirected.
(To expand a little, a window without images should only exist if:
* It's an unmanaged window.
* Screen is unredirected.)
Normally, this kind of window could be fine, as the next render phase
will re-acquire images for them. However, if a window in this state is
destroyed with fading enabled, then the render phase won't try to
acquire images for it, causing it to go into the main rendering function
without images attached, and trigger an assertion.
This commit delays the handling of root ConfigureNotify until the render
phase. This way, the images will be immediately re-acquired after they
are released, thus prevent this problem from happening.
Also adds a testcase for this.
Fixes#357
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
Currently picom fails at register_cm(), which is before
print_diagnostics(), so we don't see anything.
This commit makes sure we keep going when there is another compositor
already running. However, in this case we need to be careful to not take
the overlay window, otherwise a poorly implemented compositor (for
example, picom) will stop working.
Also restructured the target window initialization logic and added some
comments explaining the logic.
Fixes#333
leftovers:
1) config file path. Has to implement compatibility functionalities before
we can change it.
2) links in man pages. Has to migrate the repo first.
3) _COMPTON_SHADOW, it has become a defacto standard, so we have to keep
supporting it.
4) dbus names, undecided whether we should/could change it.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
