Manually add id to pprof subgraph

Author: hbmartin

.github/workflows/lint.yml

@@ -21,7 +21,6 @@ jobs:
           python-version: ${{ matrix.python-version }}
           cache: pip
           cache-dependency-path: requirements.txt
-          allow-prereleases: true
       - run: pip install -r requirements.txt
       - run: pip install black ruff pytest pytest-cov
       - run: ruff check .

test/directed/pprof.gv.txt

@@ -3,7 +3,7 @@ fontname="Helvetica,Arial,sans-serif"
 node [fontname="Helvetica,Arial,sans-serif"]
 edge [fontname="Helvetica,Arial,sans-serif"]
 node [style=filled fillcolor="#f8f8f8"]
-subgraph cluster_L { "File: [stackcollapse]" [shape=box fontsize=16 label="File: [stackcollapse]\l\lShowing nodes accounting for 380, 90.48% of 420 total\lDropped 120 nodes (cum <= 2)\lShowing top 20 nodes out of 110\l\lSee https://git.io/JfYMW for how to read the graph\l" tooltip="[stackcollapse]"] }
+subgraph cluster_L { "File: [stackcollapse]" [shape=box fontsize=16 label="File: [stackcollapse]\l\lShowing nodes accounting for 380, 90.48% of 420 total\lDropped 120 nodes (cum <= 2)\lShowing top 20 nodes out of 110\l\lSee https://git.io/JfYMW for how to read the graph\l" tooltip="[stackcollapse]"]  id="node0" }
 N1 [label="deflate\n62 (14.76%)\nof 384 (91.43%)" id="node1" fontsize=18 shape=box tooltip="deflate (384)" color="#b20400" fillcolor="#edd6d5"]
 N2 [label="gzip\n0 of 409 (97.38%)" id="node2" fontsize=8 shape=box tooltip="gzip (409)" color="#b20100" fillcolor="#edd5d5"]
 N3 [label="longest_match\n178 (42.38%)" id="node3" fontsize=24 shape=box tooltip="longest_match (178)" color="#b22800" fillcolor="#eddad5"]
@@ -52,4 +52,4 @@ N16 -> N10 [label=" 1" color="#b2b2b0" tooltip="[unknown] -> ct_tally (1)" label
 N7 -> N19 [label=" 1" color="#b2b2b0" tooltip="entry_SYSCALL_64_after_hwframe -> __x64_sys_read (1)" labeltooltip="entry_SYSCALL_64_after_hwframe -> __x64_sys_read (1)"]
 N9 -> N7 [label=" 1" color="#b2b2b0" tooltip="send_bits ... entry_SYSCALL_64_after_hwframe (1)" labeltooltip="send_bits ... entry_SYSCALL_64_after_hwframe (1)" style="dotted"]
 N13 -> N20 [label=" 1" color="#b2b2b0" tooltip="zip -> flush_block (1)" labeltooltip="zip -> flush_block (1)"]
-}
+}