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Issues with Scintilla for Qt
Qt reports character descenders are 1 pixel shorter than they really are.
There is a tweak in the code to add a pixel in. This may have to be reviewed for Qt 5.
There's a comment in the Qt code for Windows:
// ### we substract 1 to even out the historical +1 in QFontMetrics's
// ### height=asc+desc+1 equation. Fix in Qt5.
The clocks used aren't great. QTime is a time since midnight clock so wraps around and
is only accurate to, at best, milliseconds.
On OS X drawing text into a pixmap moves it around 1 pixel to the right compared to drawing
it directly onto a window. Buffered drawing turned off by default to avoid this.
Reported as QTBUG-19483.
Only one QPainter can be active on any widget at a time. Scintilla only draws into one
widget but reenters for measurement.
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