The Adaptive text editor theme is the default, and has therefore
been renamed Default for consistency with the Default theme preset.
It keeps its automatic dark/light switch status.
The Default text editor theme was actually a legacy Godot 2-style theme,
so it has been renamed to Godot 2 to match the theme preset.
Its background color has been changed to be a constant opaque color,
since the new editor theme made the theme look less good on a translucent
background. The previous background color on light theme also lacked
contrast.
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