dojo.isOpera gives incorrect 9.8 version since Opera 10

[lewar]

Opera 10 is the first browser which hit the ​double-digit version crisis.

Since then Opera's user agent string changed its form. Now it contains misleading prefix "Opera/9.80", which is similar to "Mozilla/5.0" in Firefox.

Examples of Opera's user agent string:

"Opera/9.52 (Windows NT 5.1; U; pl)"
dojo.isOpera == 9.52 <- OK!

"Opera/9.80 (X11; Linux i686; U; PLD/2.0 (Ac); pl) Presto/2.2.15 Version/10.01"
dojo.isOpera == 9.8 <- BAD

"Opera/9.80 (S60;SymbOS;OperaMobi/1209;U;pl) Presto/2.5.28 Version/10.1)"
dojo.isOpera == 9.8 <- BAD

"Opera/9.80 (X11; Linux x86_64; U; PLD/3.0 (Th); pl) Presto/2.8.131 Version/11.11"
dojo.isOpera == 9.8 <- BAD

"Opera/9.80 (Windows NT 5.1; U; pl) Presto/2.8.131 Version/11.11"
dojo.isOpera == 9.8 <- BAD

In order to detect a real Opera browser version (higher then 9.8), a "Version/11.11" suffix shoud be considered. This suffix can be extracted in a similar way as "Firefox/4.0.1" from user agent string.

[lewar]

My proposition of a patch for a current version from trunk

[Rawld Gill]

(In [25548]) fixed opera sniff; fixes #13159; thanks lewar