Find dialog hangs when searching for word not found in a larger text

[Jon Håvard Gundersen]

Scenario:

1. Paste a larger text into the editor (i.e. the gpl license ​http://www.gnu.org/licenses/gpl-3.0.txt)
2. Open the find dialog and search for word not found in the text.
3. The scripts hangs and after a while the browser ask to stop the script.

Tested in nightly build with firefox on linux and ie7 on windows.

[Martin Kou]

Confirmed. It's a pretty major bug so I'm targeting it to 2.6.1.

[Martin Kou]

btw the search seems to have gotten stuck somewhere in the middle of the GNU license so I'm quite sure this is a bug rather than a speed issue.

[Wojciech Olchawa]

Tested on IE6, IE7 and FF2 - in all of my tests the browsers collapsed.

[Martin Kou]

I was wrong yesterday. Further tests indicated that the search logic didn't actually got stuck, but the GetData() function took longer and longer to execute per call as the search proceeds down the document.

[Martin Kou]

I've written a preliminary patch which re-implements the finding logic of the Find/Replace dialog. Improvements include:

1. A factor-of-ten or greater improvement in searching performance, which eliminates the freeze up in searching long documents like the GPL 3.0. Note that while the new implementation would no longer hang scanning the GPL 3.0, it would still hang if given a much larger document - any classical search function still has to scan every DOM node and every character of the document no matter how fast it is, we aren't using quantum computers/quantum algorithms yet ;).
2. Reduced code size of fck_replace.html, because the new algorithm is simpler.

[Martin Kou]

The preliminary patch should be nearly completely functional, the only thing that doesn't work yet is the "Match whole word" option.

[Martin Kou]

#2159 and #2160 are related to this ticket.

[Martin Kou]

Updated patch which removes the FCKDomTools.ScrollIntoView() hack for Safari in the Find/Replace dialog, because the hack was found to not work.

[Martin Kou]

Updated the patch again because the match whole word option was found to not work after the search has scanned through the document the first time.

[Frederico Caldeira Knabben]

The patch is breaking simple searchs. Just try to search for "a", hitting the search button several times. It will throw a js error.

[Martin Kou]

Fixed with [1973].

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[Wojciech Olchawa]

#2216 has been marked as DUP