Fixes #20475: Collapse singleton VLAN IDs in VLANGroup display #20479
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Fixes: #20475
Summary
Collapse singleton VLAN ID ranges when rendering/storing display strings.
Input
1-5,10,20-30
remains1-5,10,20-30
instead of1-5,10-10,20-30
.Implementation
Update
utilities.ranges_to_string()
to emit a bare integer whenstart == end
.Before → After
1-5,10-10,20-30
→1-5,10,20-30