added test for single-line selection for partial commit
added test for single-line selection for partial commit

say25/desktop,artivilla/desktop,gengjiawen/desktop,gengjiawen/desktop,say25/desktop,artivilla/desktop,hjobrien/desktop,shiftkey/desktop,j-f1/forked-desktop,j-f1/forked-desktop,shiftkey/desktop,artivilla/desktop,shiftkey/desktop,say25/desktop,desktop/desktop,kactus-io/kactus,say25/desktop,BugTesterTest/desktops,shiftkey/desktop,kactus-io/kactus,gengjiawen/desktop,desktop/desktop,hjobrien/desktop,BugTesterTest/desktops,kactus-io/kactus,hjobrien/desktop,desktop/desktop,gengjiawen/desktop,j-f1/forked-desktop,hjobrien/desktop,BugTesterTest/desktops,kactus-io/kactus,BugTesterTest/desktops,desktop/desktop,artivilla/desktop,j-f1/forked-desktop