Convert dashboard stuff to use comboboxbuttons instead of the wrapped chooserdialog which seems to trigger GTK+/glib esoteric race condition bugs in glib 2.32.x
More bugfixing for the dash, seems to work quite nicely now, resizing is a bit sluggish, but that may be e17 not Mtx...
Added set transient for,  but it didn't seem to do what I intended...