- Directory is qt_themes, each theme must be in one folder
- It should contain a file "style.qss"
- It may contain an "icons" sub-directory, to override included icons
(with files like mytheme/icons/colorful/48x48/star.png for example)
- Directories ending by "_dark" are reserved for dark variant icons.
They are not listed as themes in the UI.
- If theme directory contains "dark" or "midnight", theme will be considered dark
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