When using a negative thin space (\!) in a math inset, LyX depicts it
onscreen with the same character that it uses for a positive thin space.
Once preview has done its thing the difference becomes clear but I think
it would be helpful while writing a formula if there was some visual
distinction, e.g. a different colour (if the same onscreen symbol is
going to be used). Particularly when cycling through the spaces in a
math inset (Ctrl+Space, followed by repeated pressing of the space bar),
there is no way to tell whether one is looking at positive or negative
spaces, unless the source pane is open.
There seems scope here to use asymmetric symbols to visibly represent
spaces on screen, e.g. something like \lefthalfcup, \righthalfcup from
the MnSymbol font.
Andrew
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