Editor syntax highlighting doesn't support aliased bg color

[egmontkob]

Is there an existing issue for this?

• I have searched the existing issues

Midnight Commander version and build configuration

4.8.33, git

Operating system

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Is this issue reproducible using the latest version of Midnight Commander?

• I confirm the issue is still reproducible with the latest version of Midnight Commander

How to reproduce

If the skin file uses an alias for [editor] / _default_'s background color, rather than specifying the color directly, syntax highlighting (e.g. editing a .c file) looks terrible.

At any text that uses a foreground color due to syntax highlighting, the terminal's background color peeks through instead of using the editor's default background colors.

It affects many skins.

Expected behavior

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Actual behavior

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Additional context

No response