bug#45617: <query-replace> loses the edit region. Works in 23.3, broke in 26.3

[Juri Linkov]

>>Do you mean that the region is deactivated after finishing query-replace?
>>That's how it's supposed to work.  Please always select entire region
>>before starting query-replace again.
>
> No, I always select the region, then begin <query-replace>.
>
> When I see the previous replacement in the command window:
>    Query replace in region (default _nmRoot → _nmDolRoot):
> Instead of:
>    Query replace:
>
> Then I get the bad behavior.

Maybe you use own customization, not starting with 'emacs -Q'?
This might explain that after middle mouse click
your selection region changes to lines 1-4 and is never restored.
Because with 'emacs -Q' I see that the selection is deactivated
after middle mouse click, even when the previous replacement is:
Query replace in region (default _nmRoot → _nmDolRoot):.