[openstreetmap/openstreetmap-website] Animations for traces (#2132)
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Wed Apr 3 17:20:53 UTC 2019
It looks like this is triggering a bug inside the libgd2 library, rather than the gd2-ffij wrapper: if two consecutive frames are identical, they try to create a temporary image of size 0x0. This triggers the "GD Warning", and then the trouble starts by leaving that gdImageGifAnimAddCtx method via some `goto fail_end;`
To cut a long story short, my proposal would be to skip the gif optimization mode in case both frames are identical: https://github.com/mmd-osm/openstreetmap-website/commit/7f138fb014e201e9e6b63ababf57d0f7c53bd86c
This passes the unit tests while still producing proper images.
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