The GUI highlights "sync" as a keyword. However, sync is only a keyword in the
textual format.

On the other hand, you could argue that it is acceptable that 'sync' is
highlighted: Since it is indeed a keyword in the ta format, it is not allowed
as an identifier anywhere. Thus highlighting it gives a hint that it is
actually a keyword (even though it is not usable from the gui).

I need input from others on this issue. Please comment.

I may add that 'meta' is not recognised as a keyword. I guess it should be
shown in bold face just like 'const'.

The scalar keyword should probably also be shown in bold.

I am about to add the following highlights:

enum - green (as type)
scalar - green (as type)
priority - bold (as keyword)
meta - bold (as prefix)
progress - bold (as keyword)
switch - bold (as keyword)
case - bold (as keyword)
default - bold (as keyword)

added the tokens on trunk in rev. 3558