viplex:
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...
This might be slightly unrelated, but I have also seen that some chars are seen
as two in the editor, like the emoji grin face (U+1F601) and one can put the
cursor between the two chars and type something which then produces [?][?].
...
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Hi,
I believe, this is a separate problem: the mentioned character is located
outside of the Basic Multilingual Plane  (BMP) in the unicode standard
(characters or code points until U+FFFF).
It seems, PSPad doesn't currently support a correct display of such "more
advanced" characters.
(I am not sure, whether the presence of such characters might somhow trigger the
buggy behaviour in other places of the file...?)
hth,
   vbr

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