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I'm editing a woff font file using FontForge, and I would like to add a glyph for the unicode character 0xD835.

However the box for this character has 2 crosses, one for the glyph and one for the unicode char (while usually there is only 1 cross for the glyph), moreover its description in the top bar is "surrogate high, non private use" (what does this mean?), see images below

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I tried copying a glyph from another character and pasting it into the 0xD835 box, obtaining this

enter image description here

but the character is not displaying when I use it.

Moreover, if I click on "glyph info" then FontForge crashes.

Is it possibile to solve the problem?

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D835+DC4E = 1D44E, that is the first two are surrogate codes used in pair in the UTF-16 encoding to resolve a number greater than 16 bits.

So the proper way to add a glyph is to edit 1D44E, not D835 and/or DC4E.

Click on Encoding > Reencode > ISO 10646-1 (Unicode, Full). The list of glyphs is now much larger, search for 0x0001D44E and past there the glyph.

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