bug#49544: 26.3; shift arrow command runaway

[Eli Zaretskii]

> Date: Tue, 13 Jul 2021 14:15:06 +0000
> From:  "Kunz, Chris" via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> When I try to select a region using shift+arrow, if I hold the key 
> combination down for a second or two it will
> continue selecting the text after the keys are released. It appears to enter 
> an infinite loop and only stops after
> reaching the end (or beginning) of the buffer.
> 
>  
> 
> The arrow key alone does not show the same behavior. This is reproducible 
> across major modes.

Is this some "accessibility" feature of your system, perhaps?  There's
no such feature in Emacs, AFAIK.