symbols: Add support for parsing multiple actions per level
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Add support for parsing multiple actions per level
Follow-up of commit e119cbec, in order to support parsing this extension of XKB supported by libxkbcommon, but ignoring its value (replaced by
NoAction()
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Warn when using multiple keysyms per level.
The feature was added in commit e119cbec but it previously issued no warning.
Also added a comment to explain that this is an extension to XKB that cannot work with X11, due to its intrinsic limitations.
CC @mahkoh