select all functions sharing a name for --root and --leaf

[nvxbug]

getFunctionIds collapses every function into a {name: id} dict before matching, so two functions that share a name but have distinct ids (the same symbol in different modules, which happens in perf, dtrace, sleepy and collapse-with-source input) fold to one entry and only the last survives. Selecting that name with --root or --leaf then keeps one of the subtrees and quietly drops the others.

Match against each function name directly and return every id that matches, so a name or glob that resolves to several functions yields all of them. Keeping this in getFunctionIds means prune_root and prune_leaf both receive the full root/leaf set without either caller having to know that names can repeat.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.05%. Comparing base (5cbab29) to head (b3eb47f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #119      +/-   ##
==========================================
+ Coverage   86.03%   87.05%   +1.01%     
==========================================
  Files           1        1              
  Lines        2342     2341       -1     
==========================================
+ Hits         2015     2038      +23     
+ Misses        327      303      -24     

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[nvxbug]

Pushed a test for the codecov/patch failure: a collapse fixture with two functions named foo and a --root=foo run in test.py, diffed against a committed reference, so the new matching path is covered.

[nvxbug]

any update?