[m-rev.] for review: stop generating nearby duplicate tags

[Zoltan Somogyi]

For review by anyone. The diff is with -b, due to
indentation changes.

Zoltan.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Log.mtags
Type: application/octet-stream
Size: 308 bytes
Desc: not available
URL: <http://lists.mercurylang.org/archives/reviews/attachments/20250810/7d132599/attachment-0002.obj>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: DIFF.mtags
Type: application/octet-stream
Size: 2904 bytes
Desc: not available
URL: <http://lists.mercurylang.org/archives/reviews/attachments/20250810/7d132599/attachment-0003.obj>