Merge branch '3453800-fix-and-pin' into '2.x'

composer.json

diff.views.inc

phpcs.xml

src/Controller/PluginRevisionController.php

src/DiffBuilderManager.php

src/DiffEntityComparison.php

src/DiffLayoutBase.php

src/DiffLayoutManager.php

src/Form/FieldsSettingsForm.php

src/Form/GeneralSettingsForm.php

src/Form/RevisionOverviewForm.php

src/Plugin/diff/Field/EntityReferenceFieldBuilder.php

src/Plugin/diff/Field/FileFieldBuilder.php

src/Plugin/diff/Field/ImageFieldBuilder.php

src/Plugin/diff/Layout/SplitFieldsDiffLayout.php

src/Plugin/diff/Layout/UnifiedFieldsDiffLayout.php

src/Plugin/diff/Layout/VisualInlineDiffLayout.php

src/Plugin/views/field/DiffPluginBase.php

src/VisualDiffThemeNegotiator.php

...diff_test/src/Plugin/diff/Field/TestHeavierTextPlugin.php