UI: criticals: gtk_widget_queue_draw_area: assertion 'width >= 0' failed - minor issue,
having the gnumeric window narrow, toolbar on top,
some icons including 'Background' not displayed
but in a dropdown list behind a triangle at right border:
click the dropdown triangle,
point to 'Background,
observe:
(gnumeric:143508): Gtk-CRITICAL **: 11:43:41.757: gtk_widget_queue_draw_area: assertion 'width >= 0' failed
in terminal gnumeric was started from.
hoovering over the colors produces more 'criticals',
think 'Clear Background' is missing or mis-displayed.
actual 1.12.58, observed in bin64 and bin80, bin64 sometimes
blocks shrinking the window slim enough.