implement insert_text() with insert_text_result(), some _delete_highlighted() cleanups
implement insert_text() with insert_text_result(), some _delete_highlighted() cleanups

zyga/urwid,mountainstorm/urwid,inducer/urwid,drestebon/urwid,harlowja/urwid,foreni-packages/urwid,inducer/urwid,drestebon/urwid,hkoof/urwid,ivanov/urwid,drestebon/urwid,ivanov/urwid,Julian/urwid,urwid/urwid,douglas-larocca/urwid,tonycpsu/urwid,bk2204/urwid,westurner/urwid,wardi/urwid,wardi/urwid,rndusr/urwid,bk2204/urwid,ivanov/urwid,foreni-packages/urwid,douglas-larocca/urwid,foreni-packages/urwid,harlowja/urwid,zyga/urwid,bk2204/urwid,hkoof/urwid,mountainstorm/urwid,rndusr/urwid,Julian/urwid,rndusr/urwid,urwid/urwid,hkoof/urwid,harlowja/urwid,inducer/urwid,mountainstorm/urwid,tonycpsu/urwid,zyga/urwid,tonycpsu/urwid,urwid/urwid,westurner/urwid,douglas-larocca/urwid,Julian/urwid,wardi/urwid,westurner/urwid