So, now that I've had a few days with Big Sur, I've found that sometimes it is selected, and sometimes not. No discernible rhyme or reason as to when or why. `As much as I want to keep everything to the keyboard, I've found that consistently, I can double-click the filename, and it selects ONLY the filename, without the extension. (triple-click will select filename + extension).
Not ideal, but at least I don't have to drag highlight just the filename, which was annoying, since my filenames can be long and extend beyond that painfully short filename window... which is yet another annoyance.
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