Bug 449302 - ConfigureNotify event not sent under X11 when moving the window
Summary: ConfigureNotify event not sent under X11 when moving the window
Status: RESOLVED FIXED
Alias: None
Product: kwin
Classification: Plasma
Component: compositing (show other bugs)
Version: unspecified
Platform: Kubuntu Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2022-01-28 19:40 UTC by Kettab Ali
Modified: 2022-11-07 11:07 UTC (History)
1 user (show)

See Also:
Latest Commit: https://invent.kde.org/plasma/kwin/-/commit/74eb0d861b292bdf586816902814b01515eca500
Version Fixed In:
Sentry Crash Report:

Attachments
wechat on wine (2.84 MB, video/mp4)
2022-11-01 03:22 UTC, Eric Zhang 		Details
View All Add an attachment

Note You need to log in before you can comment on or make changes to this bug.
Description Kettab Ali 2022-01-28 19:40:40 UTC 
SUMMARY

Only the last ConfigureNotify event is sent when the window is moved by the user
if composition is ON. This is not the case for the other WMs or if composition is OFF.

Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.12.9
KDE Frameworks Version: 5.44.0
Qt Version: 5.9.5
Comment 1 Vlad Zahorodnii 2022-02-02 13:58:04 UTC 
It's an optimization. Please reopen this bug report if it breaks any app.
Comment 2 Kettab Ali 2022-02-02 16:58:17 UTC 
Well, short answer: I need to keep two windows in sync.
that is, when one of them (i.e. the main window, appWindow) moves,
the other window (overlayWindow), which is always on top of the appWindow
should move as well (as if it were part of the appWindow).

This works well under Windows. by processing WM_ENTERSIZEMOVE message.

Under Linux, all the desktop flavors I tested on (GNOME, Xfce, Cinnamon, MATE, Fluxbox,..)
just work as expected too.

I wonder if Kwin could just send this event (ConfigureNotify) at least when the window starts moving
(and this would be acceptable for me) because the last event is always sent and thus, overlayWindow
can be just hidden/shown as needed. 

Regards.
Comment 3 Vlad Zahorodnii 2022-02-03 07:42:16 UTC 
I see.. We need to reevaluate whether that optimization is worth keeping it.
Comment 4 Eric Zhang 2022-11-01 03:14:29 UTC 
 This change also broke WeChat running under Wine. The WeChat login window has an application-drawn shadow surrounding its login window. When moving the login window, the shadow doesn't follow the login window immediately and only updates its position when moving is done. So the shadow window is detached when moving and suddenly jumps to the new position after moving is finished.
Comment 5 Eric Zhang 2022-11-01 03:22:30 UTC 
Created attachment 153368 [details]
wechat on wine