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Type: Bug
Resolution: Done
Priority: P2: Important
Fix Version/s: 5.6.2
Affects Version/s: 5.3.1
Component/s: GUI: Window management, QPA: X11/XCB
Labels:
None
Environment:
Ubuntu Linux and ArchLinux, Qt 5.3, X11, LXQt desktop environment, openbox window manager.

Commits:
17d68c4fc371c32bd58d0a94ac63f0170edaf29e, 29b076d61 (dev), 7864c01c7 (6.6), 78f628971 (tqtc/lts-6.2), 2e8a0b096 (6.5), bedacaec1 (tqtc/lts-5.15)

According to the API doc, passing Qt::WA_X11NetWmWindowTypes to QWidget::setAttribute() should set proper NETWM states when in X11. This used to work in Qt 4.8, but it has no effect in Qt5 when I'm using XCB backend.
I checked the source code of Qt 5 and it seems that code related to this feature is actually removed.
This feature need to be implemented in the xcb backend.

duplicates

QTBUG-55558 Menus have window type _NET_WM_WINDOW_TYPE_NORMAL instead of _NET_WM_WINDOW_TYPE_DROPDOWN_MENU

Closed

is duplicated by

QTBUG-50190 Qt::WA_X11NetWmWindowType* should be removed from documentation since it is not used

Closed

QTBUG-47043 QMenu sets _NET_WM_WINDOW_TYPE to _NET_WM_WINDOW_TYPE_NORMAL (or nothing) should be _NET_WM_WINDOW_TYPE_POPUP_MENU

Closed

resulted in

QTBUG-116696 Menus have window type _NET_WM_WINDOW_TYPE_NORMAL instead of _NET_WM_WINDOW_TYPE_POPUP_MENU

Closed

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For Gerrit Dashboard: QTBUG-39887
#	Subject	Branch	Project	Status	CR	V
111936,6	Restore documented behavior for the WA_X11NetWmWindowType* attributes	5.6	qt/qtbase	Status: MERGED	+2	0
501884,2	widget: set WA_X11NetWmWindowType* after xcb window was created	dev	qt/qtbase	Status: MERGED	+2	0
502016,2	widget: set WA_X11NetWmWindowType* after xcb window was created	6.6	qt/qtbase	Status: MERGED	+2	0
502017,2	widget: set WA_X11NetWmWindowType* after xcb window was created	6.5	qt/qtbase	Status: MERGED	+2	0
502020,2	widget: set WA_X11NetWmWindowType* after xcb window was created	tqtc/lts-6.2	qt/tqtc-qtbase	Status: MERGED	+2	0
502041,2	widget: set WA_X11NetWmWindowType* after xcb window was created	tqtc/lts-5.15	qt/tqtc-qtbase	Status: MERGED	+2	0