I saw this text in etc/NEWS
---
*** Unexpected yanking of text due to accidental clicking
on the mouse
wheel button (typically mouse-2) during wheel scrolling is
now avoided.
This behavior can be customized via the mouse-wheel-click-event and
mouse-wheel-inhibit-click-time variables.
and I don't understand it. It says that a certain problem won't
happen, but it fails to say what Emacs actually *does*.
Would someone who understands this please clarify it?
I may be wrong, but I believe this means that previously you might
accidentally press the wheel while rotating it, that was interpreted as a
mouse-2 click, and that caused a spurious yank.
Many mouse wheels also function as mouse-2, by pressing them. It is all too
easy to accidentally press the wheel while you rotate it. This fix
presumably ignores mouse-2 clicks interspersed with wheel rotations.
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