Font of the Pop-up editor sheet should default to MySQL content font

[gboudreau]

If one chooses a new font for MySQL content font:

That font should also be used by default in the pop-up sheet used to edit values.

Currently, those two fonts are different:

That's because the pop-up sheet uses either the default system font, or the default monospaced font (if you enabled Use monospaced fonts in the preferences).
Instead, if should use the user-selected content font (if defined), and then fallback to its current behaviour.

Of note: one can also change the font used in the pop-up sheet by right-clicking in it, choosing "Font > Show Fonts", and changing the font there:

Sequel-Ace will persist that change, so obviously, we should keep that behaviour: using the content font as default should only happen when noFieldEditorSheetFont has been selected.

[gms8994]

This is similar (same, maybe) as sequelpro/sequelpro#3495. There may be useful information there.