Bz737372 set min tab width

António Fernandesrequested to merge
bz737372-set-min-tab-width into master

Fix for https://bugzilla.gnome.org/show_bug.cgi?id=737372

Before: ntmw-before

After: ntmw-after

Commit messages have more details.

Spinner issue (see 2nd discussion below): spinnermakestabwider

Edited by António Fernandes

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