[okular] [Bug 420889] Shift+scroll wheel behavior broke

[Patrick]

https://bugs.kde.org/show_bug.cgi?id=420889

--- Comment #2 from Patrick <mail at patricksmits.net> ---
The original shift+wheel behavior was handled by QAbstractSlider (in
QAbstractSliderPrivate::scrollByDelta), which is inherited by QScrollBar and
triggered by QAbstractScrollArea::wheelEvent.

Possible fix:

--- src/okular-20.08.2/ui/pageview.cpp  2020-10-05 08:26:20.000000000 +0200
+++ pageview.cpp        2020-10-16 14:59:28.407667911 +0200
@@ -3123,7 +3123,9 @@ void PageView::wheelEvent(QWheelEvent *e
                 d->scroller->scrollTo(QPoint(horizontalScrollBar()->value(),
verticalScrollBar()->value()), 0); // sync scroller with scrollbar
             }
         } else {
-            if (delta != 0 && delta % QWheelEvent::DefaultDeltasPerStep == 0)
{
+            if ((e->modifiers() & Qt::ShiftModifier) == Qt::ShiftModifier) {
+                QAbstractScrollArea::wheelEvent(e);
+            } else if (delta != 0 && delta % QWheelEvent::DefaultDeltasPerStep
== 0) {
                 // number of scroll wheel steps Qt gives to us at the same
time
                 int count = abs(delta / QWheelEvent::DefaultDeltasPerStep);
                 if (delta < 0) {

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