[TYPO3-core] FYI: #13327: Update ExtJS to version 3.1

[David Bruchmann]

Hi Steffen,

Von:        Steffen Kamper <info at sk-typo3.de>
 > i discussed that with the ExtJS team. Official statement was that themes
 > are not supported and maintained, they are only included because of
 > compatibility and as example for writing own skins. So the grey skin
 > isn't complete, if you use it you get a mix of blue and grey.
 > We used the grey extended skin with some changes in t3skin, which skins
 > ExtJS completely. So use that one ;)

are there any specials to know how to get the gray images in CSS inside 
TYPO3?

I'm asking because I get blue images from the folder 
typo3\contrib\extjs\resources\images\default, so I can't follow your 
explanation.

Best Regards
David