Scrollbars for scrolling through stages and scrolling console output within a stage overlap

[Hawk777]

Jenkins and plugins versions report

Environment

Jenkins: 2.440.3
OS: Linux - 5.15.0-105-generic
Java: 17.0.10 - Private Build (OpenJDK 64-Bit Server VM)
---
active-directory:2.35
antisamy-markup-formatter:162.v0e6ec0fcfcf6
apache-httpcomponents-client-4-api:4.5.14-208.v438351942757
asm-api:9.7-33.v4d23ef79fcc8
basic-branch-build-strategies:81.v05e333931c7d
blueocean-autofavorite:1.2.5
blueocean-commons:1.27.12
blueocean-config:1.27.12
blueocean-core-js:1.27.12
blueocean-dashboard:1.27.12
blueocean-events:1.27.12
blueocean-git-pipeline:1.27.12
blueocean-i18n:1.27.12
blueocean-jwt:1.27.12
blueocean-personalization:1.27.12
blueocean-pipeline-api-impl:1.27.12
blueocean-pipeline-scm-api:1.27.12
blueocean-rest:1.27.12
blueocean-rest-impl:1.27.12
blueocean-web:1.27.12
bootstrap5-api:5.3.3-1
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commons-lang3-api:3.13.0-62.v7d18e55f51e2
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font-awesome-api:6.5.1-3
git:5.2.1
git-client:4.7.0
github:1.38.0
github-api:1.318-461.v7a_c09c9fa_d63
github-branch-source:1787.v8b_8cd49a_f8f1
gitlab-plugin:1.8.0
gson-api:2.10.1-15.v0d99f670e0a_7
htmlpublisher:1.33
http_request:1.18
instance-identity:185.v303dc7c645f9
ionicons-api:70.v2959a_b_74e3cf
jackson2-api:2.17.0-379.v02de8ec9f64c
jakarta-activation-api:2.1.3-1
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joda-time-api:2.12.7-29.v5a_b_e3a_82269a_
jquery3-api:3.7.1-2
json-api:20240303-41.v94e11e6de726
json-path-api:2.9.0-58.v62e3e85b_a_655
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mapdb-api:1.0.9-40.v58107308b_7a_7
matrix-auth:3.2.2
matrix-project:822.824.v14451b_c0fd42
mattermost:3.1.3
metrics:4.2.21-449.v6960d7c54c69
mina-sshd-api-common:2.12.1-101.v85b_e08b_780dd
mina-sshd-api-core:2.12.1-101.v85b_e08b_780dd
okhttp-api:4.11.0-172.vda_da_1feeb_c6e
parameterized-scheduler:262.v00f3d90585cc
parameterized-trigger:787.v665fcf2a_830b_
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pipeline-graph-analysis:216.vfd8b_ece330ca_
pipeline-graph-view:240.v92d72e312999
pipeline-groovy-lib:704.vc58b_8890a_384
pipeline-input-step:495.ve9c153f6067b_
pipeline-milestone-step:119.vdfdc43fc3b_9a_
pipeline-model-api:2.2198.v41dd8ef6dd56
pipeline-model-definition:2.2198.v41dd8ef6dd56
pipeline-model-extensions:2.2198.v41dd8ef6dd56
pipeline-rest-api:2.34
pipeline-stage-step:312.v8cd10304c27a_
pipeline-stage-tags-metadata:2.2198.v41dd8ef6dd56
pipeline-utility-steps:2.16.2
plain-credentials:179.vc5cb_98f6db_38
plugin-util-api:4.1.0
promoted-builds:945.v597f5c6a_d3fd
pubsub-light:1.18
rebuild:332.va_1ee476d8f6d
resource-disposer:0.23
reverse-proxy-auth-plugin:1.7.7
run-condition:1.7
scm-api:689.v237b_6d3a_ef7f
script-security:1335.vf07d9ce377a_e
sidebar-link:2.4.1
snakeyaml-api:2.2-111.vc6598e30cc65
sse-gateway:1.26
ssh-agent:367.vf9076cd4ee21
ssh-credentials:337.v395d2403ccd4
ssh-slaves:2.948.vb_8050d697fec
sshd:3.322.v159e91f6a_550
structs:337.v1b_04ea_4df7c8
subversion:1256.vee91953217b_6
token-macro:400.v35420b_922dcb_
trilead-api:2.142.v748523a_76693
variant:60.v7290fc0eb_b_cd
workflow-aggregator:596.v8c21c963d92d
workflow-api:1291.v51fd2a_625da_7
workflow-basic-steps:1049.v257a_e6b_30fb_d
workflow-cps:3894.vd0f0248b_a_fc4
workflow-durable-task-step:1336.v768003e07199
workflow-job:1400.v7fd111b_ec82f
workflow-multibranch:773.vc4fe1378f1d5
workflow-scm-step:427.v4ca_6512e7df1
workflow-step-api:657.v03b_e8115821b_
workflow-support:896.v175a_a_9c5b_78f
ws-cleanup:0.45

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

Ubuntu 22.04 (Jenkins server), Gentoo (web browser)

Reproduction steps

1. Run a pipeline which has one stage with lots of steps, and where one of the steps produces lots of output.
2. Navigate to the Pipeline Console page for that build.
3. In the left sidebar, navigate to the stage.
4. In the right pane, scroll to the step with lots of output and use the expander triangle to view its console output.

Expected Results

There should either be just one scrollbar in the right pane (with the console output pushing subsequent steps down), or there should be two scrollbars both logically and visually nested inside each other, the outer being to scroll through steps and the inner to scroll through lines of console output.

Actual Results

There are two scrollbars, and while they are logically nested, they are not visually nested; instead, they overlap, preventing one of them from being clicked on at all. See attached screenshot; note the two circled scrollbar thumbs and that they are in a vertical line with each other.

Anything else?

This is with Firefox 115.10.0ESR under XFCE 4.18.

Are you interested in contributing a fix?

No response