#5 Sort playlist on response to doubleclicks only

[Phil Stracchino]

Ever accidentally clicked on a column header while
adjusting column widths, cursed loudly, then gone back
to the Query page and regenerated the playlist you just
accidentally sorted? Annoying, isn't it?

This patch adds a few lines of code to filter out
accidental column header clicks, and sort the playlist
ONLY in response to a doubleclick, defined as two
consecutive clicks within 500ms on the same column
header. It was written against 0.7.2 but applies
cleanly against anything at least up to 0.7.5.

[Phil Stracchino]

playlist sorting doubleclick patch, gzipped