The way it works now is:
- Border select is using TWEAK, for which you need to hold LMB down
and move mouse. This prevents operators using RELEASE/CLICK events
from being fired.
- LMB select is using RELEASE event, this is no selection happens
before border if you do border select. And this prevents any
operator uses CLICK event from being fired.
- Delect all happens by CLICK, which would be fired only in case no
operators were handled with PRESS/RELEASE.
This is a bit cards-house, but this is how events currently works and
wouldn't want inventing something bigger now.
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