Whenever the user might be using a mouse (or finger for touchscreen) to interact with text, e.g., selecting text or positioning a cursor for editing, the text should be in monospace font, because precisely positioning a mouse cursor among long thin characters like lowercase L in proportional font is difficult by Fitts Law.
Ironically, it is old-school terminal applications which use monospace, despite them mostly not using the mouse, perhaps running in environments (e.g. console) which don't take mouse input. These would be fine in proportional font.
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