Add gap-tree multi-column reading order sorting - #2

Add gap-tree multi-column reading order sorting#2

luw2007 wants to merge 3 commits into

batu3384:mainbatu3384/ScreenTextGrab:mainfrom

luw2007:feature/gap-tree-multicolumn-sortingluw2007/ScreenTextGrab:feature/gap-tree-multicolumn-sortingCopy head branch name to clipboard