Review Request 110333: Fix cross-process Drag&Drop in KoDocumentSectionView

[Dmitry Kazakov]

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http://git.reviewboard.kde.org/r/110333/
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Review request for Calligra.


Description
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It happens so, that when the cross-process Drag is dropped to the KoDocumentSectionView, some spurious MouseMove event come and start another Drag (effectively, cancelling the current one). I guess, that happens due to some weird order of setting up of event filters (in QWidget and in QDragManager), so that the QWidget's filter gets the MouseMove events before the QDragManager's one. Actually, QWidget should not get any MouseMove events during Dragiing. It should get DragMoveEvents instead.

This patch workarounds this problem (i guess, Qt is the cause) and drops all the MouseMove events when they come while the Dragging operation. I activate the workaround on X11 only, because, most probably, Qt's D&D works differently on Windows.

This patch fixed bug:
https://bugs.kde.org/show_bug.cgi?id=319334


Diffs
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  krita/plugins/extensions/dockers/defaultdockers/kis_layer_box.cpp 12689ed 
  krita/ui/kis_mimedata.h 7055043 
  krita/ui/kis_mimedata.cpp 64af6b3 
  krita/ui/kis_node_model.h c1854a0 
  krita/ui/kis_node_model.cpp 3a21127 
  krita/ui/kis_view2.cpp 7d4c6da 
  krita/ui/tests/kis_model_index_converter_test.cpp 80a3117 
  krita/ui/tests/kis_node_model_test.cpp 1c9bb21 
  libs/main/KoDocumentSectionView.h 7a535cb 
  libs/main/KoDocumentSectionView.cpp 768c671 

Diff: http://git.reviewboard.kde.org/r/110333/diff/


Testing
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Tested vastly on the Layer Box in Krita.


Thanks,

Dmitry Kazakov

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