You may also need to change “width-request”. I think these two interact somewhat. And you may also have to make the overall dialog larger to make room for the longer line. Getting these dialogs to behave well and fit nicely is sometimes frustrating, as the various widgets can be resized by other factors, and unless the various ‘expand’ and “fill” values on each widget and the enclosing widgets are set right, Gtk will sometimes ignore the settings.
Oh, it is not necessary to restart Gramps when editing the glade files, only to close/reopen the Gui element that the glade file is defining, in this case the person editor.
I store some private notes about hack patches and configuration. I go so far as to add the hacked module as media object. This allows me to quickly open the impacted module & reapply the patch.
I understand that there are tools for such configuration management. I just don’t have the free bandwidth to learn something that I’ll have to re-learn each time because of the long intervals between use.