Feature request: Allow locking find and replace to the current selected block

[julian9499]

Have you searched existing Github issues to see if someone has already requested this feature?
Yes

Is your feature request related to a problem? Please describe.
I would like to be able to quickly perform a find and replace on a piece of text. I am able to do that in Heynote, but it requires some carefulness since the find and replace module works on all text in Heynote. I would love to be able to lock the find and replace to the block only to make use of the replace all button without global repercussions.

Describe the solution you'd like
I think a checkbox that says "limit to current active block" would suffice.

Describe alternatives you've considered
It would also be possible to apply the operations only within the current selected text.