Background

Over the years various pieces of code have been accumulated that either never get run or do not apply to anything.

User story

As a developer I want a better understanding of the code I actually need to support.

Requirements

• Remove unused config options per T409350.
• Toggler using event bus emits a 'section-toggled' event that is never used. gerrit
• The modules mobile.pagelist.styles and mobile.pagesummary.styles are only used on Special:EditWatchlist so should be merged into amobile.special.styles and scoped to .mw-special-EditWatchlist.mw-mf-amc-disabled so we have two less modules to maintain. (gerrit)
• The includes/template/ContentBox.mustache template is no longer used gerrit
• We provide unmaintained styles for MobileFrontend + Vector skins which is not publicly accessible in skinStyles/mobile.startup/vector.less gerrit
• In src/mobile.init/mobile.init.js we have the following code block relating to a localStorage migration that happened 2 years ago (gerrit)

function migrateXLargeToLarge() {
	if ( document.documentElement.classList.contains( 'mf-font-size-clientpref-xlarge' ) ) {
		if ( mw.user.isAnon() ) {
			mw.user.clientPrefs.set( FONT_SIZE_KEY, 'large' );
		} else {
			api.saveOption( FONT_SIZE_KEY, 'large' );
		}
	}
}

function migrateLegacyExpandAllSectionsToggle() {
	const currentValue = mw.storage.get( 'expandSections' );
	if ( currentValue ) {
		if ( mw.user.isAnon() ) {
			mw.user.clientPrefs.set( SECTION_COLLAPSING_TOGGLE, '1' );
		} else {
			api.saveOption( SECTION_COLLAPSING_TOGGLE, '1' );
		}
		storage.remove( 'expandSections' );
	}
}

migrateXLargeToLarge();
migrateLegacyExpandAllSectionsToggle();

• Following T385509 mobile.special.mobileoptions.scripts.js has a function infuseToggles which is only used once and only applies to one item. This should be simplified (possibly renaming infuseToggle. Original discussion/context. (gerrit)

BDD

• For QA engineer to fill out

Test Steps

• For QA engineer to fill out

Design

• Add mockups and design requirements

Acceptance criteria

• Add acceptance criteria

Communication criteria - does this need an announcement or discussion?

• Add communication criteria

Rollback plan

• What is the rollback plan in production for this task if something goes wrong?

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