Comment 142 for bug 1512120

(In reply to Emil Mikulic from comment #41)
> The attached diff increments the refcount before creating the deferred
> reload, then decrements it after the reload runs. I haven't been able to
> repro the crash since.

I pushed a slightly simplified version of this patch to my fork:
https://github.com/jlindgren90/thunar/commit/e2d169d0c67d

Also fixes the drag-and-drop crash for me.