SCI_GETCOLUMN/SCI_FINDCOLUMN does not take character representations into account

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Dear Scintilla hackers,

I notice that SCI_GETCOLUMN and SCI_FINDCOLUMN do not take the length of
character representations into account. A character with a representation is
always counted as one even if it takes up several characters. Looking into
Document::GetColumn() it's pretty obvious that there is currently no
expansion of character representations.

Considering that these messages do take the display size of tabs into
account, IMHO it would make sense if it took the size of representations into
account as well. Imagine a document with many character representations and
trying something like "put the cursor into the same column, just 10 lines
earlier".

If Neil agrees that this is a bug/shortcoming, I could look into this and
prepare a patch.

Best regards,
Robin

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