I have encountered the following problem a few times.
I comment on a bug and then press the "Post" button. After posting I spot an error in my comment: I used a wrong URL linking to the wrong bug number or I misspelled a word.
A "preview" of the comments showing it as it would look after posting would be nice. This would allow me to click on URLs before posting avoiding links to wrong bug numbers.
I have encountered the following problem a few times.
I comment on a bug and then press the "Post" button. After posting I spot an error in my comment: I used a wrong URL linking to the wrong bug number or I misspelled a word.
A "preview" of the comments showing it as it would look after posting would be nice. This would allow me to click on URLs before posting avoiding links to wrong bug numbers.