JOSM should not allow creation of tags that are too long

[AM909]

Often, when combining imported TIGER ways, the resulting way will have a tiger:tlid value that is over 255 chars in length, and this will fail upon uploading.

JOSM should warn the user about this at the time of combining, and provide a reasonable solution, like truncating or adding a secondary tag (like tiger:tlid_1).

Similarly, any time a user attempts to create a tag or value that is > 255 chars, JOSM should prevent it at the time of editing, not wait for it to fail during upload.

[anonymous]

Closed as duplicate of #4827.