Allow choice to edit using VisualEditor or Source editor.

[dbrant]

https://phabricator.wikimedia.org/T431812
https://phabricator.wikimedia.org/T432409
https://phabricator.wikimedia.org/T422153

[voyagerfan]

@cooltey I've the feature branch and it looks good.

[Copilot]

Pull request overview

Copilot reviewed 13 out of 13 changed files in this pull request and generated no new comments.

Suppressed comments (2)

app/src/main/java/org/wikipedia/page/PageActivity.kt:535

• This branch cannot observe normal app-icon launches: both launcher aliases target MainActivity (AndroidManifest.xml:96,107), while this PR removed the corresponding handling there. As a result, apps-open no longer emits actionSource = "app_icon". Keep this event handling in MainActivity (or route launcher intents here).

        if (intent.action == Intent.ACTION_MAIN && intent.categories?.contains(Intent.CATEGORY_LAUNCHER) == true) {
            TestKitchenAdapter.client.getInstrument("apps-open")
                .submitInteraction(action = "app_open", actionSource = "app_icon")

app/src/main/java/org/wikipedia/page/PageActivity.kt:557

• After handling a wikipedia:// return, execution falls through to line 641 and opens the callback URI with NEW_TAB_FOREGROUND. Because this single-task activity normally receives the browser return through onNewIntent while the edited tab is still active, both saved and abandoned callbacks create a duplicate tab, and the saved refresh can race that new load. Return after handling an existing-page callback, and only load the URI when restoring from a cold start.

            if (uri.scheme == "wikipedia") {
                uri = uri.buildUpon().scheme(WikiSite.DEFAULT_SCHEME).build()
                uri.getQueryParameter("saved")?.let {
                    if (it == "true") {