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This commit reduces the memory footprint of QGraphicsWidget by
around 40% (from around 663 bytes to around 409 bytes - measured
using /proc/<pid>/statm on Linux - see 'man 5 proc').
The technique used is to lazily allocate (on the heap) certain
data structures (i.e. not allocate them unless they are needed):
- QGraphicsLayoutItemPrivate::userSizeHints
=> used only if the size, width, or height is explicitly set
- QGraphicsWidgetPrivate::margins
=> used only if the contents margins are accessed
- QGraphicsWidgetPrivate::windowFrameMargins
=> used only if the window frame margins are accessed
- QGraphicsWidgetPrivate::windowData
=> used only if the graphics widget is a window
In addition, a few unused data members (and related code) were removed:
- QGraphicsWidgetPrivate::contentsRect
- QGraphicsWidgetPrivate::mouseDelta
- QGraphicsWidgetPrivate::*LayoutItemMargin
Reviewed-by: andreas
Task-number: 251592
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