Some pinned fonts do not work with Text Tool

Describe the bug Bug found trying to reproduce a Text Tool issue (internal report): https://igarastudio.zendesk.com/agent/tickets/10266 The pinned fonts in aseprite.ini were:

[PinnedFonts]
0000 = Arial,size=200,weight=400
0001 = Arial,size=200,weight=900
0002 = system=Arial,size=200,italic,weight=400
0003 = system=Arial,size=50,weight=400
0004 = system=HoloLens MDL2 Assets,size=200
0005 = system=Verdana,size=200

When selecting fonts 0000, 0001, or 0004 in the Text Tool, the following behavior occurs:

• For new text: the font falls back to the aseprite font, but no warning or alert is displayed.
• While editing existing text: the font that was active before selecting 0000, 0001, or 0004 continues to be used. After this, commands to toggle bold/italics or change the font size do not respond until a valid font is selected again.

Font 0004 (HoloLens MDL2 Assets) is not present on the system, so it would be good to alert the user that the selected font is unavailable.

Fonts 0000 and 0001 reference Arial without the system= prefix. These appear to reference the Arial font from fonts.xml, but there seems to be a bug when using this font, as it exhibit the same behavior as a missing font.

Aseprite & System

• Aseprite: 1.3.18.5
• System: MacOS