Review Request 127847: Fix invisible window with Qt 5.6

[Elvis Angelaccio]

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https://git.reviewboard.kde.org/r/127847/
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(Updated May 5, 2016, 3:30 p.m.)


Review request for KDE Utils.


Bugs: 360105
    http://bugs.kde.org/show_bug.cgi?id=360105


Repository: kcalc


Description (updated)
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Since Qt 5.6, `minimumSize()` returns an empty size (`QSize(0, 0)`). 

This cause an invisible main window in KCalc, due to a `setFixedSize(minimumSize())` call.

This (new?) behavior is documented in the [QWidget api](http://doc.qt.io/qt-5/qwidget.html#minimumSize-prop), so it doesn't look like a bug in Qt.

The proper way to set a fixed size (based on the actual content) is to use `QLayout::setSizeConstraint()`, as suggested by the [documentation](http://doc.qt.io/qt-5/qwidget.html#setFixedSize) of `setFixedSize()` itself.


Diffs
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  kcalc.cpp 13b7bd3 

Diff: https://git.reviewboard.kde.org/r/127847/diff/


Testing
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KCalc is now visible again with Qt 5.6. The main window size is fixed as before.


Thanks,

Elvis Angelaccio

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