when selecting a commit, ensure the first file is selected and it's diff rendered
when selecting a commit, ensure the first file is selected and it's diff rendered

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