Previously, the last of each range having Extended_Pictograph property
was not processed as so. Ouch!
Test:
$ echo x > null; hb-shape null -u U+1f43b,U+200d,U+2744,U+fe0f
Before:
[gid0=0+1000|gid0=2+1000]
After:
[gid0=0+1000|gid0=0+1000]
Caught by https://github.com/harfbuzz/harfbuzz/issues/3017