I would call it an IDE bug that selection is inconsistent WRT backslashes. Relevant UI actions include ctrl-left/right (skip over a word), ctrl-shift-left/right (select a word), ctrl-backspace or ctrl-delete (delete a word), double-click (select a word), and ctrl-D -I -U (automatic token selection). Some of these include the backslash and others don’t (and at times it seems like it’s carefully chosen to do the opposite of what you wanted). It may be better if none of them ever included the backslash.
I realized later about keyword:: that it might be good to extend its definition to allow a hierarchy. Currently there’s no way to distinguish between e.g. numFrames belonging to a buffer wavetable fill event vs numFrames belonging to a cue-file event. Pondering that one.
hjh