Reproducing the bug: Open any Web page Click on the Middle mouse button to start panning without moving the mouse. Two Panning icons overlap with a 3x3pixels offset. Panning arrows are also offset by 3x3 pixels during panning action.
Created attachment 38368 [details] Changed middlePanningCursor icon size constant and hotspot
I don't think you actually want hyatt here. :) I'm surprised we don't get the dimensions from the icon directly instead of hard-coding them. This looks fine, but I'd like one of the windows folks to say OK. (When they do, they can also mark this commit-queue+ since you're not a committer.)
Comment on attachment 38368 [details] Changed middlePanningCursor icon size constant and hotspot Looks fine to me, though I agree it isn't great that we are hard-coding these numbers.
Comment on attachment 38368 [details] Changed middlePanningCursor icon size constant and hotspot Clearing flags on attachment: 38368 Committed r47636: <http://trac.webkit.org/changeset/47636>
All reviewed patches have been landed. Closing bug.