[Wayland-bugs] [Bug 763387] Make window creation hooks in tab DnD work on wayland

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763387

--- Comment #1 from Carlos Garnacho <carlosg at gnome.org> ---
Created attachment 323532
  --> https://bugzilla.gnome.org/attachment.cgi?id=323532&action=edit
gtkdnd: Check whether the target is handled by the widget

This avoids widgets from "managing" drag and drop (eg. returning TRUE
in their handlers) for mimetypes they're even not meant to handle. This
makes the DnD machinery work in a similar way to event bubbling, the
first widget found (from bottom to top) that manages the target and returns
TRUE in their handlers will win.

This eg. avoids cases like textviews in notebooks, which are both
capable of DnD, yet the textview will be returning TRUE for the
GTK_NOTEBOOK_TAB target used by notebooks, this would make it ignore
the textview and let the notebook handle the target.

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