Add mousewheel zoom/scroll and auto scrolling of selected tools
Detail: The mouse wheel can now be used to * scroll up/down * +shift to scroll left/right * +control to zoom in/out on an open sprite editing window. The sprite editing window will auto scroll when the mouse approaches the border with * the move whole sprite "hand" tool * the copy block "camera" tool * the move block "scissors" tool Admin: Submission for the Paint bounty. Version 2.23. Tagged as 'Paint-2_23'
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