508a13ae72
We need to keep track of the pointer emulating touch sequence. In order to have events properly redirected on touch devices, the Clutter.grab_pointer and ungrab_pointer() have been replaced by the grab() and grab_sequence() ClutterInputDevice methods, one or the other is used depending on the device triggering DnD. An extra "sequence" argument has been added to startDrag, passing null here will resort to pointer grabs. This is enough to make thumbnails in the WorkspaceBox draggable through touch. https://bugzilla.gnome.org/show_bug.cgi?id=756748
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