Solving issue #3497, #3500, #3498 and #3483

For issue #3483, the old behavior is restored, i.e. the minimum width of
the ProfilePanel combobox is the maximum width of its content.

Style updated for the Exif and IPTC sub-tabs

rtgui/profilestore.cc

@@ -518,6 +518,7 @@ ProfileStoreComboBox::ProfileStoreComboBox ()
     updateProfileList();
     Gtk::CellRendererText* cellRenderer = dynamic_cast<Gtk::CellRendererText*>(get_first_cell());
     cellRenderer->property_ellipsize() = Pango::ELLIPSIZE_MIDDLE;
+    cellRenderer->property_ellipsize_set() = true;
 }
 
 Glib::ustring ProfileStoreComboBox::getCurrentLabel()