[openstreetmap/openstreetmap-website] User's should not be allowed to have invisible names (Issue #6642)

[Tom Hughes]

tomhughes left a comment (openstreetmap/openstreetmap-website#6642)

The obvious test to employ is that the unicode column count for the name is non-zero - all unicode codepoints have a width of 0, 1 or 2 columns so you can just sum that for the codepoints in the name and check it's not zero.

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