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The bug unicode-combining is marked as fixed. However, it mentioned that the sequence of code points occupying a character cell ought to be maintained in Normalisation Form C (see UAX #15). This has not yet been done, although combining character support is complete in all other respects.
I was originally convinced of the need for normalisation simply
because it was what
xterm did. I'm now less certain,
and I wonder if it ought to be configurable (and if so whether the
particular normalisation form in use ought to be configurable too).
Regardless, this is a big job, and in particular it will require considerable code size increase since normalisation is a job needing large tables. Therefore, I fear it will have to wait until we have mdpi done.