Avoid cursor jumping to end of line edit when user edits search term

Ingo Klöckerrequested to merge
work/kloecker/t7510 into master

We have a signal-slot loop to keep the search term in sync between different components. By comparing the "new" value with the current value we break the loop and avoid that the cursor jumps to the end of the text in the input field when the user types into the input field.

GnuPG-bug-id: 7510

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