kwin/scripting
David Edmundson d485dfe7ef Avoid crash with on scripted window teardown with threaded quick render loop
Summary:
Qt render loops behave quite differently to each other.

KWin scripting as a workaround for another situation cleans
(17553e5a1f) handles tracking of script
windows by deleting the underlying window handle on hide.

This currently happens before the window gets the hideEvent.

Arguably this is a quirk with Qt, but in the current state:

- QSGThreadedRenderLoop deletes the platform window and cleans up
- We then get the hide() event. This no-ops because there's no window.
   (else branch of     case WM_TryRelease in qsgthreadedrenderloop.cpp)
- We carry on rendering animations despite having no platform
- undefined behaviour

Normally this isn't a problem as typically destruction of the platform window
happens only when a window is being deleted, we're messing with Qt
internals here.

If we make sure the QHideEvent is processed by the render loop first,
things seem fine.

BUG: 397767

Test Plan:
Ran QSG_RENDER_LOOP=threaded
Read output with scenegraph logging rules on

Reviewers: #kwin, broulik

Reviewed By: broulik

Subscribers: kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D15025
2018-09-13 10:19:12 +01:00
..
CMakeLists.txt
dbuscall.cpp
dbuscall.h
documentation-effect-global.xml
documentation-global.xml
genericscriptedconfig.cpp
genericscriptedconfig.h
genericscriptedconfig.json
kwinscript.desktop
Messages.sh Fix message extraction 2018-05-20 08:14:50 +03:00
meta.cpp
meta.h
screenedgeitem.cpp
screenedgeitem.h
scriptedeffect.cpp [scripting] Fix effect.animate() curve argument being actually used 2018-08-07 21:33:29 +01:00
scriptedeffect.h [scripting] Fix effect.animate() curve argument being actually used 2018-08-07 21:33:29 +01:00
scripting.cpp Avoid crash with on scripted window teardown with threaded quick render loop 2018-09-13 10:19:12 +01:00
scripting.h Remove Qt module declarations in includes 2018-06-05 18:07:23 +01:00
scripting_logging.cpp
scripting_logging.h
scripting_model.cpp
scripting_model.h
scriptingutils.cpp
scriptingutils.h
timer.cpp
workspace_wrapper.cpp
workspace_wrapper.h Remove Qt module declarations in includes 2018-06-05 18:07:23 +01:00