In this video: Rant about condescending robots trying to sound friendly.
Adding an under-all frame for all the widgets so the unusual gridding structure imposed by the Border class can mostly be ignored.
Realizing an under-all frame `self.window` already exists in the Dialogue class and making a few adjustments.
Making a modal dialogue in Tkinter so only the top window is accessible for interaction.
Changing the citation input in the source edit dialog to a Combobox.
Starting on the work to get the source edit dialog to function as intended.
