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Details

Type: Bug
Resolution: Fixed
Priority: P2: Important
Fix Version/s: 5.12, 5.14
Affects Version/s: 5.7.0, 5.12.0
Component/s: QPA: X11/XCB
Labels:
None
Environment:
KWin/X11

Platform/s:

Linux/X11
Commits:
4f370d36ec5caa02f78545ceee5704d94edf0530(5.14) 283d9b01dc3ab6c95c688b0e5f5c98c41ca22d30(5.12)

Description

Window Manager Environment:

KWin 5.15.5、KWin 5.8.6
Enable Always hidden previews, or manually add configuration items:

cat ~/.config/kwinrc:

[Compositing]
...
HiddenPreviews=6
...

After that, when WinWindow requests are minimized, KWin does not change the WM_STATE property.

Yes, KWin maybe is wrong. But I see X11 document from https://specifications.freedesktop.org/wm-spec/1.3/ar01s05.html：

_NET_WM_STATE_HIDDEN

_NET_WM_STATE_HIDDEN should be set by the Window Manager to indicate that a window would not be visible on the screen if its desktop/viewport were active and its coordinates were within the screen bounds. The canonical example is that minimized windows should be in the _NET_WM_STATE_HIDDEN state. Pagers and similar applications should use _NET_WM_STATE_HIDDEN instead of WM_STATE to decide whether to display a window in miniature representations of the windows on a desktop.

Implementation note: if an Application asks to toggle _NET_WM_STATE_HIDDEN the Window Manager should probably just ignore the request, since _NET_WM_STATE_HIDDEN is a function of some other aspect of the window such as minimization, rather than an independent state.

Whether the meaning of this paragraph can be understood as: when the _NET_WM_STATE attribute does not contain _NET_WM_STATE_HIDDEN, the window is not considered to be minimized?

KWin does not change the WM_STATE property of the window, but the _NET_WM_STATE property of the window is indeed changed. _NET_WM_STATE_HIDDEN is added when the window is minimized, otherwise it will be removed.

Please refer to the attached code, execute in KWin will get the following output:

begin show minimize
QFlags<Qt::WindowState>(WindowMinimized)
WM_STATE(WM_STATE):
		window state: Normal
		icon window: 0x0
_NET_WM_STATE(ATOM) = _NET_WM_STATE_HIDDEN
end show minimize




begin active window
WM_STATE(WM_STATE):
		window state: Normal
		icon window: 0x0
_NET_WM_STATE(ATOM) = 
end active window




QFlags<Qt::WindowState>(WindowMinimized)