#1481 [GTK3] incorrect event copying

[Colomban Wendling]

Apparently, with GTK3 gdk_drag_begin() accesses fields from the passed in event that aren't copyable by value -- whereas it worked with GTK2. So, one need to properly use gdk_event_copy() instead of ev = *event to copy the event.

Without this, starting a drag with a GTK3 Scintilla accesses freed memory.

Attached is the output from Valgrind when starting a drag under GTK3.

[Colomban Wendling]

Example patch, but since I don't really know C++ it's probably quite ugly where it does non-C things.

[Colomban Wendling]

BTW, gdk_event_copy() seems to exists since forever: https://developer.gnome.org/gdk2/stable/gdk2-Events.html#gdk-event-copy
So there probably is no need to have different code paths for GTK2 and 3.

[Neil Hodgson]

Committed as [e48831].