Parallel stages reset stage nesting level in Pipeline Console

Jenkins and plugins versions report

Environment

```text Jenkins: 2.426.3 OS: Windows 11 - 10.0 Java: 11.0.16.1 - Microsoft (OpenJDK 64-Bit Server VM) --- ant:497.v94e7d9fffa_b_9 antisamy-markup-formatter:162.v0e6ec0fcfcf6 apache-httpcomponents-client-4-api:4.5.14-208.v438351942757 bootstrap5-api:5.3.2-3 bouncycastle-api:2.30.1.77-225.v26ea_c9455fd9 branch-api:2.1144.v1425d1c3d5a_7 build-timeout:1.32 caffeine-api:3.1.8-133.v17b_1ff2e0599 checks-api:2.0.2 cloudbees-folder:6.858.v898218f3609d commons-lang3-api:3.13.0-62.v7d18e55f51e2 commons-text-api:1.11.0-95.v22a_d30ee5d36 credentials:1311.vcf0a_900b_37c2 credentials-binding:657.v2b_19db_7d6e6d display-url-api:2.200.vb_9327d658781 durable-task:543.v262f6a_803410 echarts-api:5.4.3-2 email-ext:2.104 font-awesome-api:6.5.1-2 git:5.2.1 git-client:4.6.0 github:1.37.3.1 github-api:1.318-461.v7a_c09c9fa_d63 github-branch-source:1772.va_69eda_d018d4 gradle:2.9 gson-api:2.10.1-15.v0d99f670e0a_7 instance-identity:185.v303dc7c645f9 ionicons-api:56.v1b_1c8c49374e jackson2-api:2.16.1-373.ve709c6871598 jakarta-activation-api:2.0.1-3 jakarta-mail-api:2.0.1-3 javax-activation-api:1.2.0-6 javax-mail-api:1.6.2-9 jaxb:2.3.9-1 jjwt-api:0.11.5-77.v646c772fddb_0 joda-time-api:2.12.6-21.vca_fd74418fb_7 jquery3-api:3.7.1-1 json-path-api:2.9.0-33.v2527142f2e1d junit:1256.v002534a_5f33e ldap:711.vb_d1a_491714dc mailer:463.vedf8358e006b_ matrix-auth:3.2.1 matrix-project:822.824.v14451b_c0fd42 metrics:4.2.18-442.v02e107157925 mina-sshd-api-common:2.12.0-90.v9f7fb_9fa_3d3b_ mina-sshd-api-core:2.12.0-90.v9f7fb_9fa_3d3b_ okhttp-api:4.11.0-157.v6852a_a_fa_ec11 pam-auth:1.10 pipeline-build-step:540.vb_e8849e1a_b_d8 pipeline-github-lib:42.v0739460cda_c4 pipeline-graph-analysis:202.va_d268e64deb_3 pipeline-graph-view:215.vc0ea_557e4d6f pipeline-groovy-lib:704.vc58b_8890a_384 pipeline-input-step:477.v339683a_8d55e pipeline-milestone-step:111.v449306f708b_7 pipeline-model-api:2.2175.v76a_fff0a_2618 pipeline-model-definition:2.2175.v76a_fff0a_2618 pipeline-model-extensions:2.2175.v76a_fff0a_2618 pipeline-rest-api:2.34 pipeline-stage-step:305.ve96d0205c1c6 pipeline-stage-tags-metadata:2.2175.v76a_fff0a_2618 pipeline-stage-view:2.34 plain-credentials:143.v1b_df8b_d3b_e48 plugin-util-api:3.8.0 resource-disposer:0.23 scm-api:683.vb_16722fb_b_80b_ script-security:1313.v7a_6067dc7087 simple-theme-plugin:176.v39740c03a_a_f5 snakeyaml-api:2.2-111.vc6598e30cc65 ssh-credentials:308.ve4497b_ccd8f4 ssh-slaves:2.948.vb_8050d697fec structs:337.v1b_04ea_4df7c8 timestamper:1.26 token-macro:400.v35420b_922dcb_ trilead-api:2.133.vfb_8a_7b_9c5dd1 variant:60.v7290fc0eb_b_cd workflow-aggregator:596.v8c21c963d92d workflow-api:1289.va_cf779f32df0 workflow-basic-steps:1042.ve7b_140c4a_e0c workflow-cps:3853.vb_a_490d892963 workflow-durable-task-step:1317.v5337e0c1fe28 workflow-job:1385.vb_58b_86ea_fff1 workflow-multibranch:773.vc4fe1378f1d5 workflow-scm-step:415.v434365564324 workflow-step-api:657.v03b_e8115821b_ workflow-support:865.v43e78cc44e0d ws-cleanup:0.45 ```

What Operating System are you using (both controller, and any agents involved in the problem)?

Windows 11 23H2

Reproduction steps

Run the following pipeline script:

node {
    stage("Top-Level") {
        stage("Parallel 1") {
            parallel(a: {echo "a"}, b: {echo "b"})
        }
        stage("More Stuff") {
            echo "Hello"
        }
    }
}

Expected Results

Output in the Pipeline Console in the shape of:

Top-Level
  Parallel 1
    a
    b
  More Stuff

Actual Results

"More Stuff" is at the root, instead of being nested under the "Top-Level" stage.

Top-Level
  Parallel 1
    a
    b
More Stuff

Anything else?

This feels like it's probably related to #51, but feels like a simpler case than the issue described there. I'm not nesting parallel stages inside each other - rather, my parallel stage is inside a normal stage.

Are you interested in contributing a fix?

No response

jenkinsci / pipeline-graph-view-plugin