wenzelm [Fri, 28 Feb 2014 22:19:29 +0100] rev 55813
allow completion within a word (or symbol), like semantic completion;
no special treatment for History_Text_Field, due to lack of active range rendering;
wenzelm [Fri, 28 Feb 2014 22:11:52 +0100] rev 55812
more regular buffer_range, despite 47e8c8daccae;
more robust invalidate_range, which is relevant when editing at the end of the buffer (NB: last line offset by be outside actual buffer length);