Review Request 122320: use xcb-screen count instead of qguiapplication.screens

[Nick Shaforostoff]

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https://git.reviewboard.kde.org/r/122320/
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(Updated Feb. 2, 2015, 9:15 p.m.)


Review request for kde-workspace, Martin Gräßlin and Thomas Lübking.


Changes
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-declare XCB an optional dependency
-add a check of current qt platform (xcb/wayland)


Repository: plasma-workspace


Description
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this patch makes kcminit behave like in kde4: it uses proper xcb screen count which may be different from QGuiApplication::screens().count().

for example when i connext external monitor via vga to my laptop, xcb screen count is still '1', while QGuiApplication::screens().count() returns '2'.

switching from QGuiApplication to QCoreApplication still wasn't possible because modules like 'mouse' need gui initialized and would crash if kcminit uses QCoreApplication.


Diffs (updated)
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  components/CMakeLists.txt 42c820f 
  startkde/kcminit/CMakeLists.txt b17951f 
  startkde/kcminit/main.cpp 1008966 

Diff: https://git.reviewboard.kde.org/r/122320/diff/


Testing
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i have built kcminit on ubuntu vivid alpha 32-bit, replaced binaries and libraries in the system and successfuly could run kcminit_startup and reboot also went fine.


Thanks,

Nick Shaforostoff

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