Comment 10 for bug 1126858

Create new text document with contents "Hello, World".
Turn on change tracking (under Edit).
Select Find and Replace (under Edit).
Put "Hello" (no quotes) in both the find and the replace boxes.
Click on "More".
Put cursor in Replace box.
Click on Format.
Set it to, say Italic (leave other options empty). Accept.

And now, for the fatal part: Click "Replace all".
If you just replace one, you'll see why the latter fails. The replacement value gets inserted beofre the original, so then it continues on and sees the original again... ad infinitum.

What should happen: If it just put its position after the original text when searching and replacing, it wouldn't have this problem.