SMM: Easy way to 'defrag' shard map by merging adjacent fragmented ranges

After using the Split-Merge tool multiple times to move around shard ranges, it's possible to end up with a highly 'fragmented' shard map that has several contiguous ranges mapped to the same shard. e.g. in the below layout, the mappings to Shard 2 are 'fragmented' and could potentially be merged into a single mapping. On a large scale this may cause perf and usability issues.

[0, 10) --> Shard 1
[10, 11) --> Shard 2
[11, 12) --> Shard 2
[12, 13) --> Shard 2
[13, 14) --> Shard 2
[14, 15) --> Shard 2
[15, 20) --> Shard 3

It would be nice to have a simple way to automatically detect and merge these mappings.