(The text from '-A user signs up... confirmed. )))' is copy/pasted from a support ticket.)
I am selecting the text in grey exactly like shown and then apply insert Quote. Then, unexpectedly the whole text between the ((( Suggestion: .... confirmed. ))) -or the rest of the posting for that matter- is erased.
It doesn't happen however when I select the text like this:
(Without including the white spaces)
Selecting it like that, it put the quotes brackets correctly around the selected text, without erasing the rest of the posting.
I use Chrome 34.0.1847.116 m on Windows 7.