[4.1 beta 3] backspace deletes quote

To repeat this...

• Quote someone
• Type some text
• Press the backspace on your keyboad to delete some of your text
• The whole quote just got deleted

Version information

Version: 26.0.1656.60 - Opera is up to date
Update stream: Stable
System: Windows 8.1 64-bit (WoW64)
Browser identification

Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36 OPR/26.0.1656.60