Fix bug in Wimp_WhichIcon
When matching an icon on the iconbar the window is initially matched correctly, but the "is this the right task" filter step was trying to compare the handle with -1. The result was that you would get the first match for any iconbar icon rather than a match for *your* iconbar icon. Unrelated: Tiling.s/Iconbar.s add a couple of comments and use symbols instead of magic numbers. Tested with a quality 3 line BASIC program, no longer returns icon #0 all the time. Version 5.23. Tagged as 'Wimp-5_23'
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