I just had a 30 line error dialog pop up, with no way to copy the text out for ease of bug reporting/googling. At least Error Dialogs (if not all dialogs), should have their text selectable, so it can be copy'n pasted out. I have no clue where to look in the code for that one though, it might even lend itself to an easy hack...
*** This bug has been marked as a duplicate of bug 46193 ***