Review Request: use _NET_WM_STATE_HIDDEN to check if the window is minimized instead of WM_STATE == ICONIC when possible.

[Thomas Lübking]

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Random addendums:
- state hidden is also provided by metacity, icewm, openbox and compiz
- mappingState() is part of the public API, thus not cut off (if you actually want to know it)
- not unmapping windows has more issues than the pager/taskbar, so it's not like minimization wasn't still "broken" by the setting (non-kde/clients relying on rather the actual mapping state to stall output processing etc.)

- Thomas Lübking


On Jan. 9, 2013, 9:06 p.m., Yichao Yu wrote:
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> http://git.reviewboard.kde.org/r/108308/
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> (Updated Jan. 9, 2013, 9:06 p.m.)
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> Review request for kdelibs, kwin and Aaron J. Seigo.
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> Description
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> When setting "Keep window thumbnails" to "Always (Breaks minimization)", kwin will keep WM_STATE to be NORMAL when a client is minimized while including _NET_WM_STATE_HIDDEN in its _NET_WM_STATE, as confirmed by ICCCM[1] and Extended Window Manager Hints[2]. However, apart from the expected result (breaks minimization: the client will continue to refresh its content) the minimized window is not shown as minimized in icontasks and pager.
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> These two plasma addons (and probably other addons as well) uses KWindowInfo::isMinimized to determine whether the window is minimized. However, this function threat all window that are not Iconic (WM_STATE != ICONIC) as not minimized, in contradiction to the "Extended window manager hints" which says, "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."
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> This patch correct this behavior and therefore correct the behavior of both pager and icontasks in this situation.
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> [1] http://tronche.com/gui/x/icccm/sec-4.html#s-4.1.3.1
> [2] http://standards.freedesktop.org/wm-spec/wm-spec-1.3.html#id2731936
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> Diffs
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>   kdeui/windowmanagement/kwindowinfo_x11.cpp d983c9a 
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> Diff: http://git.reviewboard.kde.org/r/108308/diff/
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> Testing
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> Compiled, pager and icontasks shows minimized windows correctly.
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> Thanks,
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> Yichao Yu
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