Find incorrectly tracks line selection

[fvisagie]

Ensure the script has at least four lines containing the same Find text.
Position the selection above the first entry.
Open and configure Find, and click Find next.
The selection moves to the first entry.
Keeping Find open, click on the third line containing the Find text.
Click Find next.

One would expect the selection to move to the fourth entry, but instead it moves to the second.

[Paranoja]

Patch to track this issue

[plorkyeran]

(In [4810]) If the user changes the active row in the middle of searching, search from the new active row even if it's after the last found row. Closes #1004