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The class was little changed during lifetime of Qt4, so it was possible
to relatively easy backport them. This changeset is based on Qt4.8.7.
The changes include:
* This fixes several issues on "old-school multihead" X11 setups (with
several screens per display i.e. when DISPLAY has form ":x.y" also
known as "TDE_MULTIHEAD" or "Zaphod mode"). In particular:
* fix graphical drag&drop problems across displays.
* fix menus being displayed outside of the screen.
* add screenCountChanged() signal
* emit resized() signal
See-also: https://github.com/qt/qt/blob/v4.8.7/src/gui/kernel/qdesktopwidget_x11.cpp
Signed-off-by: Alexander Golubev <fatzer2@gmail.com>
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