[KDE/Mac] Review Request 126624: respect "ShowIconsOnButtons" in the Qt5/KF5 style

[René J.V. Bertin]

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https://git.reviewboard.kde.org/r/126624/
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Review request for KDE Software on Mac OS X, KDE Frameworks and Yichao Yu.


Repository: qtcurve


Description
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Implementation details have changed in Qt5 that affect when icons were being shown in pushbuttons; as a result, many buttons were drawn with icons visible regardless the `ShowIconsInButtons` preference.

This patch implements a solution in the Qt5 style itself, which appears to be the only way to respect the preference both robustly (= on all buttons) and reversibly (i.e. icons will appear or disappear when toggling the setting without need to restart running applications).
Buttons that have only an icon but no text will continue to show the icon.

Note that `KGlobalSettings::showIconsOnPushButtons()` is deprecated and will have to be replaced with something that is not...


Diffs
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  qt5/style/qtcurve_api.cpp 9b7adfa 

Diff: https://git.reviewboard.kde.org/r/126624/diff/


Testing
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On OS X 10.9.5 and Linux, both with Qt 5.5.1 and KF5 5.17.0 installed into /opt/local


Thanks,

René J.V. Bertin

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