[openstreetmap/openstreetmap-website] Changeset tags exceed limit of 255 unicode codepoints (Issue #6350)

[Tom Hughes]

tomhughes left a comment (openstreetmap/openstreetmap-website#6350)

The TAG SPACE characters may well behave weirdly in Java because they're outside the BMP so while they are one codepoint they will need to be encoded as a surrogate pair in the UTF-16 encoding that Java uses so there will be two UTF-16 values for each one which would add an extra four to the length.

You probably want to use `String.codePointCount` instead of the normal length function.

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