this.addMode("S", "Add a search keyword", elem => bookmarks.addSearchKeyword(elem));
this.addMode("v", "View hint source", (elem, loc) => buffer.viewSource(loc, false));
this.addMode("V", "View hint source in external editor", (elem, loc) => buffer.viewSource(loc, true));
this.addMode("S", "Add a search keyword", elem => bookmarks.addSearchKeyword(elem));
this.addMode("v", "View hint source", (elem, loc) => buffer.viewSource(loc, false));
this.addMode("V", "View hint source in external editor", (elem, loc) => buffer.viewSource(loc, true));