labwc currently doesn't handle output layout changes very well:
- Windows can end up "lost" completely offscreen
- Maximized/fullscreen windows can end up spanning multiple outputs
Currently, new_output_notify() and output_destroy_notify() contain logic
to update the cursor and force a repaint when outputs are added or
removed. This logic in fact needs to run on any output layout change,
so consolidate it into a new function, output_update_for_layout_change().
Then add a second new function, view_adjust_for_layout_change(), which
adjusts window placement to account for the new layout.
The behavior is roughly as follows:
- Normal windows that end up offscreen are centered on the closest
output (making use of the existing view_center() logic)
- Maximized windows are re-maximized on the closest output. Logic is
also added to the unmaximize step to check that the original
unmaximized position is still on-screen.
- Fullscreen windows are re-fullscreened on the same output if
possible; otherwise they are un-fullscreened.
Minimized windows don't require any special handling. Their placement
is adjusted just the same, but invisible to the user until they are
later unminimized.
There is some positioning glitch still with un-fullscreening a window
whose output has been disconnected/disabled; it can end up in an
unexpected position (but at least has the correct size and decoration).
I don't think this is due to a bug in my change per se, but perhaps the
change has exposed a bug elsewhere.
Fixes: #177
Before this change a window that had been minimized showed up with states Minimized and Activated.
For foreign-toplevel clients like taskbars that could mean to handle multiple windows at once
having a 'activated' state even though they were clearly minimized.
Fixes a crash in move to edge ( #77 ) when the centre of the window is out of any display regions.
Doesn't fix the expected behaviour that it would work, but much better than the whole compositor dying.
Signed-off-by: Joshua Ashton <joshua@froggi.es>
