OK, this is definitely just the fault of gtksourceview.  It creates a
GtkSourceCompletionContext object with a floating ref, but doesn't sink
the ref until it wants to finalize it (using an unusual ref_sink/unref
pair of calls).

Which means that when Python wants to create a wrapper Python object for
the context, it naturally does a ref_sink/unref pair itself, which would
work fine as a normal ref/unref pair if someone had already indicated
they wanted to own it by sinking the ref themselves.  But since the
context floating ref was never sunk for some reason, the Python wrapper
ends up freeing the object.

This is an upstream bug too.  I'll file a bug & patch and link here.
But first an SRU.

** Package changed: gedit (Ubuntu) => gtksourceview3 (Ubuntu)

** Changed in: gtksourceview3 (Ubuntu)
       Status: Confirmed => Triaged

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https://bugs.launchpad.net/bugs/857707

Title:
  gedit crashed with SIGSEGV in g_type_get_qdata()

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