Attached is a replacement patch which I believe fixes the issue with the
region selection direction and with indentation potentially being
incorrectly applied to text that is inserted by the template.

Previously when text was being inserted at the region start it was
actually going into region, which means that it will have been possible
for template contents to have accidentally been indented along with the
region that the user selected.  I've changed the marker insertion type
for the start boundary, which should preserve the original indentation
of text which was inserted by the template, i.e. if text inserted by the
template should be indented this is now back under control of the
template rather than applied by accident.

The changes do mean that the indentation of existing templates may
change, but I think this will only be for templates which accidentally
omitted the indentation directives because indentation was mistakenly
applied as part of the region.