Convert the PageView from a QScrollArea + inner QWidget to a QAbstractScrollArea.
- added few utility functions to compensate the miss of a "central scrolled widget", as now we just fully handle (events & painting) the viewport of the scroll area - manually scroll the overlay widgets (form widgets and video widgets) when the "area" is scrolled All the page view functionalities should be working as usual, hopefully I should have ported everything (in case it will be fixed later). Given that now the size page view is no more constrained by the maximum size of a QWidget (which is two orders of magnitude less than the size of an int), we can handle documents with really many pages (10k+) with hopefully no issues. BUG: 191859 As a side effect of the QScrollArea -> QAbstractScrollArea porting, it seems that there are no more drawing glitches when in right-to-left mode. BUG: 192636 svn path=/trunk/KDE/kdegraphics/okular/; revision=989285
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