bug#52751: 27.1; Go back to editing the from part in query replace

[ndame]

>
> Preinserting an arrow by default would be confusing for users.

I'm thinking of a UI where the user can access both FROM and TO
at the same time while it's clear which is which. E.g. something
like fields:

  Replace ______ with ______

where you can move around the two values freely before submitting.

The current UI is limiting, because it forces you to input
sequentially with no ability to correct the previous value.
It's better to have something resembling dialog window