Strange things can occur when you Paste from clipboard text containing more than one tab separator. e.g.
- a b Z
This displays as bZ in the Replace field, yet copying it to the clipboard shows the tab is still there.
After a Swap, the Find column ends up displaying bZ, and copying it to the clipboard shows the tab is still there.
Yet pasting this back from the clipboard, results in b in the Find field and Za in the Replace field.
I guess this is wholly logical, but it is something the filter design has not really anticipated.
Something to consider?:
After a Paste from clipboard, converting any such extra tabs into the pattern \t in the Replace field.