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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Mouse click vs drag
Date: Tue, 22 Sep 2020 20:07:55 +0300
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Tue, 22 Sep 2020 12:24:32 -0400
> 
> > Clicks are difficult to achieve with hires display, because the mouse
> > cursor tends to move a couple of pixels or so when pressing and
> > releasing mouse buttons.  Eg. in Customize buffers it is difficult to
> > push "Apply" or "Apply and Save" buttons.
> 
> IIRC, the "same position" check is not looking at pixel position but
> character position

It checks both, AFAICT.