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Workaround focus issue by using the size-allocate signal (Closes: #988951).

Cyril Brulebois requested to merge size-allocate3 into master

Compared to the original focus_path() callback, this updated version no longer disconnects itself, and needs to retain the specified GtkTreePath.

XXX: Memory management, the GtkTreePath is no longer free'd.

I'm not familiar enough with best practices when it comes to callbacks, data they need, etc. or with reference handling…

I kept the patch minimal to show what seems to work fine even if the path is leaked. Maybe someone has a magic idea to fix that, my fallback plan would be to keep trace of that GtkTreePath via an extra member of fe->data (aka. fe_data), so that the existing one can be freed right before creating a new one… Another kludge, but oh well.

/cc @smcv

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