[find/replace overlay] disabling RegEx resets to the wrong base-location

[Wittmaxi]

This Issue Documents a review-comment from the find/replace overlay PR
which could not be addressed into the current proposal
comment by @HeikoKlare

disabling the regex search option leads to some unexpected search match being highlighted. If I am not mistaken, it is the one after the incremental base position before enabling the regex option:

This should be taken into account (and may even implicitly be addressed) when refactoring the way in which the incremental base position is set from outside the FindReplaceLogic. If I understand correctly, the position is reset by disabling and enabling the incremental search option, but that is only a side effect (that does not always apply, like when the regex option is enabled). Probably, resetting the incremental base position when the logic is not (or even cannot) be aware of that necessity should be done in a more explicit way.