Test minimap search decorations

[RMacfarlane]

Refs: #75216

• Mac @misolori
• Linux @mjbvz
• Windows @gregvanl

Complexity: 3

When using the find widget in the editor, matches should now also be highlighted in the minimap. Note that if there are over 1000 matches, a much more limited set of find decorations will be shown.

• Verify matches are rendered in correct position for different sizes of minimap, zooming in a ton will eventually resize the minimap
• Try toggling the Render Characters setting of the minimap
• Try using full-width and tab characters