Version: (using KDE 4.3.4) Installed from: Ubuntu Packages I set up an example webpage that demonstrates the bug. It is a PHP script that outputs 5000 HTML input-checkboxes next to each other in ONE line. Try to open it with kate, it will take minutes: http://www.pietzowski.de/longline.php Now I have a different example where a \n is put right after each input-tag. It's the same HTML content but kate has opened this file in milliseconds: http://www.pietzowski.de/longline.php?newline Seems like one long lines freeze Kate.
*** This bug has been marked as a duplicate of bug 210464 ***