Diff display in jobConfigHistory plugin looks weird

[felfert]

Jenkins and plugins versions report

Environment

Jenkins: 2.401.1
OS: Linux - 6.3.4-101.fc37.x86_64
Java: 17.0.7 - Red Hat, Inc. (OpenJDK 64-Bit Server VM)
---
all-changes:1.5
analysis-model-api:11.3.0
ant:487.vd79d090d4ea_e
antisamy-markup-formatter:159.v25b_c67cd35fb_
apache-httpcomponents-client-4-api:4.5.14-150.v7a_b_9d17134a_5
authentication-tokens:1.53.v1c90fd9191a_b_
blueocean:1.27.4
blueocean-autofavorite:1.2.5
blueocean-bitbucket-pipeline:1.27.4
blueocean-commons:1.27.4
blueocean-config:1.27.4
blueocean-core-js:1.27.4
blueocean-dashboard:1.27.4
blueocean-display-url:2.4.2
blueocean-events:1.27.4
blueocean-git-pipeline:1.27.4
blueocean-github-pipeline:1.27.4
blueocean-i18n:1.27.4
blueocean-jwt:1.27.4
blueocean-personalization:1.27.4
blueocean-pipeline-api-impl:1.27.4
blueocean-pipeline-editor:1.27.4
blueocean-pipeline-scm-api:1.27.4
blueocean-rest:1.27.4
blueocean-rest-impl:1.27.4
blueocean-web:1.27.4
bootstrap5-api:5.3.0-1
bouncycastle-api:2.28
branch-api:2.1109.vdf225489a_16d
caffeine-api:3.1.6-115.vb_8b_b_328e59d8
checks-api:2.0.0
cloud-stats:267.v577e3742c282
cloudbees-bitbucket-branch-source:809.vc1d904b_30426
cloudbees-folder:6.815.v0dd5a_cb_40e0e
cmakebuilder:4.1.1
command-launcher:100.v2f6722292ee8
commons-lang3-api:3.12.0-36.vd97de6465d5b_
commons-text-api:1.10.0-36.vc008c8fcda_7b_
compact-columns:1.185.vf3851b_4d31fe
conditional-buildstep:1.4.2
config-file-provider:938.ve2b_8a_591c596
console-column-plugin:197.vcf5a_ec1d7b_47
copyartifact:705.v5295cffec284
createjobadvanced:1.9.0
credentials:1254.vb_96f366e7b_a_d
credentials-binding:604.vb_64480b_c56ca_
dark-theme:336.v02165cd8c2ee
dashboard-view:2.487.vcf0ff9008a_c0
data-tables-api:1.13.4-2
display-url-api:2.3.7
doxygen:178.v6ea_ef5f7dfdb
dtkit-api:3.0.2
durable-task:507.v050055d0cb_dd
echarts-api:5.4.0-5
envinject:2.901.v0038b_6471582
envinject-api:1.199.v3ce31253ed13
extended-read-permission:53.v6499940139e5
external-monitor-job:203.v683c09d993b_9
external-workspace-manager:1.3.1
favorite:2.4.2
file-operations:131.v32b_e7824fe95
font-awesome-api:6.4.0-1
forensics-api:2.3.0
git:5.1.0
git-client:4.4.0
github:1.37.1
github-api:1.314-431.v78d72a_3fe4c3
github-branch-source:1728.v859147241f49
gradle:2.8
gravatar:2.2
handy-uri-templates-2-api:2.1.8-22.v77d5b_75e6953
htmlpublisher:1.31
http_request:1.16
instance-identity:173.va_37c494ec4e5
ionicons-api:56.v1b_1c8c49374e
jackson2-api:2.15.2-350.v0c2f3f8fc595
jakarta-activation-api:2.0.1-3
jakarta-mail-api:2.0.1-3
javadoc:233.vdc1a_ec702cff
javax-activation-api:1.2.0-6
javax-mail-api:1.6.2-9
jaxb:2.3.8-1
jclouds-jenkins:2.31
jdk-tool:66.vd8fa_64ee91b_d
jenkins-design-language:1.27.4
jersey2-api:2.39.1-2
jjwt-api:0.11.5-77.v646c772fddb_0
jnr-posix-api:3.1.17-1
job-dsl:1.84
job-restrictions:0.8
jobConfigHistory:1212.vd4470d08ff12
jquery3-api:3.7.0-1
jsch:0.2.8-65.v052c39de79b_2
junit:1207.va_09d5100410f
lockable-resources:1167.v04861534072b_
log-parser:2.3.0
mailer:457.v3f72cb_e015e5
mapdb-api:1.0.9-28.vf251ce40855d
matrix-auth:3.1.8
matrix-project:789.v57a_725b_63c79
mina-sshd-api-common:2.10.0-69.v28e3e36d18eb_
mina-sshd-api-core:2.10.0-69.v28e3e36d18eb_
okhttp-api:4.11.0-145.vcb_8de402ef81
pam-auth:1.10
parameterized-trigger:2.45
pipeline-build-step:496.v2449a_9a_221f2
pipeline-github-lib:42.v0739460cda_c4
pipeline-graph-analysis:202.va_d268e64deb_3
pipeline-groovy-lib:656.va_a_ceeb_6ffb_f7
pipeline-input-step:468.va_5db_051498a_4
pipeline-milestone-step:111.v449306f708b_7
pipeline-model-api:2.2141.v5402e818a_779
pipeline-model-definition:2.2141.v5402e818a_779
pipeline-model-extensions:2.2141.v5402e818a_779
pipeline-rest-api:2.33
pipeline-stage-step:305.ve96d0205c1c6
pipeline-stage-tags-metadata:2.2141.v5402e818a_779
pipeline-stage-view:2.33
pipeline-utility-steps:2.15.4
plain-credentials:143.v1b_df8b_d3b_e48
plugin-util-api:3.3.0
powershell:2.0
prism-api:1.29.0-7
publish-over:0.22
pubsub-light:1.17
run-condition:1.5
scm-api:676.v886669a_199a_a_
script-security:1251.vfe552ed55f8d
simple-theme-plugin:160.vb_76454b_67900
snakeyaml-api:1.33-95.va_b_a_e3e47b_fa_4
sse-gateway:1.26
ssh-credentials:305.v8f4381501156
ssh-slaves:2.877.v365f5eb_a_b_eec
sshd:3.303.vefc7119b_ec23
structs:324.va_f5d6774f3a_d
subversion:2.17.2
theme-manager:193.vcef22f6c5f2b_
timestamper:1.25
token-macro:359.vb_cde11682e0c
translation:1.16
trilead-api:2.84.v72119de229b_7
urltrigger:1.02
variant:59.vf075fe829ccb
view-job-filters:364.v48a_33389553d
warnings-ng:10.2.0
workflow-aggregator:596.v8c21c963d92d
workflow-api:1215.v2b_ee3e1b_dd39
workflow-basic-steps:1017.vb_45b_302f0cea_
workflow-cps:3691.v28b_14c465a_b_b_
workflow-durable-task-step:1247.v7f9dfea_b_4fd0
workflow-job:1308.v58d48a_763b_31
workflow-multibranch:756.v891d88f2cd46
workflow-scm-step:415.v434365564324
workflow-step-api:639.v6eca_cd8c04a_a_
workflow-support:839.v35e2736cfd5c
xcode-plugin:2.0.17-565.v1c48051d46ef
xtrigger-api:1.0
xunit:3.1.2

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

Controller: see Environment above
Client: Linux, Fedora37, Firefox 114.0

Reproduction steps

1. Have jobConfigHistory installed
2. Change some job's config
3. Invoke Job Config History
4. Click on "Show Diffs" Button

Expected Results

Fully dark display

Actual Results

Anything else?

No response

[timja]

cc @NotMyFault