autocmd should be attached to local buffer, not globally

[vits]

Current implementation causes problems working with multiple buffers. To reproduce open any CSS file in gvim (could be empty) and after that open or create new buffer with different filetype, for example b.txt and type anything like CSS color, like #123.

You get this:

Error detected while processing function <SNR>21_PreviewCSSColorInLine..<SNR>21_MatchColorValue:
line    3:
E121: Undefined variable: b:color_pattern

This happens becaus autocmd in css.vim attaches function calls to all buffers. Fix this by changing lines to

autocmd CursorMoved  <buffer> silent call s:PreviewCSSColorInLine()
autocmd CursorMovedI <buffer> silent call s:PreviewCSSColorInLine()

[ap]

D’oh.