Bz737372 set min tab width
Fix for https://bugzilla.gnome.org/show_bug.cgi?id=737372
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Spinner issue (see 2nd discussion below): 
Edited by António Fernandes
Fix for https://bugzilla.gnome.org/show_bug.cgi?id=737372
Before:
After:
Commit messages have more details.
Spinner issue (see 2nd discussion below):