Is it possible to choose or set a fix-width font for texts displayed within tooltips? So, when hovering over an element?
I want to add additional information to particular elements using ASCII-art drawings. This only works with non-proportional fonts.
Yes, it is. yEd's tool tips support HTML formatted text. E.g.
<html><head></head><body><span style="font-family:'Monospaced';">text here</span></body></html>
should result in the desired formatting.
