tdf#123851 Qt5 handle broken ScrollBar values
If the scrollbar has a mnMin == 0 and mnMax == 0 then nVisibleSize
is set to -1?! I don't know if a negative nVisibleSize makes any
sense, so this just handles this case without crashing LO with a
SIGFPE in the Qt library. If min == max then the visible size is
just zero.
It's actually not clear, that this crash is the same then the bug
report, but it fixes at least the later reproducer crash.
Change-Id: Ib2dd51ddecfd24ddf2d89f746cbc8975269e13da
Reviewed-on: https://gerrit.libreoffice.org/82600
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>
Tested-by: Jenkins
Reviewed-by: Ilmari Lauhakangas <ilmari.lauhakangas@libreoffice.org>
(cherry picked from commit 9bc848cf0d301aa57eabcffa101a1cf87bad6470)
Reviewed-on: https://gerrit.libreoffice.org/82619
diff --git a/vcl/qt5/Qt5Graphics_Controls.cxx b/vcl/qt5/Qt5Graphics_Controls.cxx
index c82bcdc..7271023 100644
--- a/vcl/qt5/Qt5Graphics_Controls.cxx
+++ b/vcl/qt5/Qt5Graphics_Controls.cxx
@@ -495,13 +495,17 @@ bool Qt5Graphics_Controls::drawNativeControl(ControlType type, ControlPart part,
if (horizontal)
option.state |= QStyle::State_Horizontal;
//setup parameters from the OO values
// If the scrollbar has a mnMin == 0 and mnMax == 0 then mnVisibleSize is set to -1?!
// I don't know if a negative mnVisibleSize makes any sense, so just handle this case
// without crashing LO with a SIGFPE in the Qt library.
const long nVisibleSize = (sbVal->mnMin == sbVal->mnMax) ? 0 : sbVal->mnVisibleSize;
option.minimum = sbVal->mnMin;
option.maximum = sbVal->mnMax - sbVal->mnVisibleSize;
option.maximum = sbVal->mnMax - nVisibleSize;
option.maximum = qMax(option.maximum, option.minimum); // bnc#619772
option.sliderValue = sbVal->mnCur;
option.sliderPosition = sbVal->mnCur;
option.pageStep = sbVal->mnVisibleSize;
option.pageStep = nVisibleSize;
if (part == ControlPart::DrawBackgroundHorz)
option.upsideDown
= (QGuiApplication::isRightToLeft()
