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Changes between Initial Version and Version 1 of Ticket #521, comment 1

initial	v1
1	1	Thanks, we should never send the tray icons as {{{png/P}}} or {{{png/L}}}: those encodings save space by subsampling colours, but since tray icons are small this doesn't save anything at all, in fact in some cases it may even make things bigger (adding the palette to the pixel data).
	2
	3	Could well be related to #500