JetNews: stretch / "maybe" parity items (Navigation 3, SharedTransition, sample-side polish)

[jonathanpeppers]

Catch-all for JetNews upstream features that are too speculative / out-of-scope / sample-side to file individually. Use this as a parking lot — items can be promoted to standalone issues if/when they become priorities.

Recent progress: #207 landed the five easy sample-side wins (pull-to-refresh, snackbar bookmark feedback, share AlertDialog, inline OutlinedTextField search swap, Intent.ACTION_SEND helper). What is left on this tracker now needs real library work.

Library gaps (would need real bindings or design work)

• Navigation 3 (androidx.navigation3) — JetNews uses NavDisplay + entryProvider + NavKey + rememberSceneState + rememberListDetailSceneStrategy. We currently have nothing in this namespace; our samples roll their own NavController shim. Big effort: would replace our nav layer wholesale.
• List-detail two-pane scene (ListDetailScene.list(...) + rememberListDetailSceneStrategy) — depends on Navigation 3. Article opens in the right pane on expanded screens (master/detail).
• SharedTransitionLayout + SharedTransitionScope — shared-element transitions across NavDisplay scenes (e.g. the article hero image flying from the list to the detail screen). Animation API binding.
• Deep links (DeepLinkPattern + kotlinx.serialization) — https://developer.android.com/jetnews/post/{id} opens the right article. Depends on Navigation 3 + a kotlinx-serialization story. (PR JetNews: pull-to-refresh, snackbar feedback, share dialog (and friends) — chips at #159 #207 builds a synthetic URL of this shape for the Intent.ACTION_SEND payload, so once deep links work the shared URL would actually resolve.)
• Modifier.interceptKey(Key.Enter) — handles a specific hardware/IME key on a focused composable. Needed to make PR JetNews: pull-to-refresh, snackbar feedback, share dialog (and friends) — chips at #159 #207's OutlinedTextField search bar actually filter the feed on Enter. Niche modifier binding.
• Glance app widget (androidx.glance) — entirely separate Jetpack toolkit; XML-less remote-views. Tracked elsewhere for Jetchat (Jetchat parity: API 26+ Settings/Widget drawer section + Glance app-widget discoverability #149); same blockers apply here.

Sample-side polish (no library gap; just JetNews work)

• Wire PullToRefreshBox (Bind PullToRefreshBox (Material 3 pull-to-refresh) #53, already bound) into the home feed — JetNews: pull-to-refresh, snackbar feedback, share dialog (and friends) — chips at #159 #207
• Add a SnackbarHost to home + post screens for "bookmark added / removed" feedback — JetNews: pull-to-refresh, snackbar feedback, share dialog (and friends) — chips at #159 #207 (load-error snackbar intentionally skipped; inline error UI stayed in place)
• Replace NoOp share button with an AlertDialog ("Functionality not available 😞") — JetNews: pull-to-refresh, snackbar feedback, share dialog (and friends) — chips at #159 #207
• Replace NoOp search icon with an inline OutlinedTextField search bar — JetNews: pull-to-refresh, snackbar feedback, share dialog (and friends) — chips at #159 #207 (UI shipped; submit-on-Enter still blocked on Modifier.interceptKey above)
• Intent.ACTION_SEND share helper from the share button (.NET-for-Android side, not a Compose binding) — JetNews: pull-to-refresh, snackbar feedback, share dialog (and friends) — chips at #159 #207
• Localize strings via stringResource once Bind stringResource(id) so samples can pull UI strings from values/strings.xml #146 lands (currently hard-coded section titles)

Why "maybe"

Several of these (Navigation 3, SharedTransition, Glance) would 2-3× the binding surface area for a single sample's benefit. Others (interceptKey, share intent) are tiny but niche. Promoting any item to its own issue is fine when there's a concrete need — until then, leaving them grouped avoids issue-tracker noise.

Related

• Bridge DrawerState.open() / close() so drawer items can auto-close on tap #140 DrawerState suspend
• Bind AnnotatedString + SpanStyle for inline-run text styling (Link/Bold/Italic/Code spans) #141 AnnotatedString
• Bind Modifier.nestedScroll + TopAppBarDefaults scroll behaviors (pinned / enterAlways / exitUntilCollapsed) #142 Modifier.nestedScroll + TopAppBar scroll behaviors
• Bind WindowSizeClass / currentWindowAdaptiveInfo for adaptive layouts #143 WindowSizeClass / adaptive info
• Bind custom Layout {} primitive — Measurable / Placeable / MeasureScope #144 custom Layout {}
• Expose ContentScale + Alignment slots on the Image facade #145 Image ContentScale / Alignment
• Bind stringResource(id) so samples can pull UI strings from values/strings.xml #146 stringResource
• Jetchat parity: API 26+ Settings/Widget drawer section + Glance app-widget discoverability #149 Glance widget (Jetchat tracker)
• Jetchat parity: messageFormatter (AnnotatedString) — *bold*, _italic_, ~strike~, code, @mention, URL #153 messageFormatter (AnnotatedString, Jetchat)

[jonathanpeppers]

#207 picks up five of the easy / cheap sample-side bullets from this tracker:

• PullToRefreshBox in the home feed — wraps the home LazyColumn; pull gesture calls HomeViewModel.RefreshAsync().
• SnackbarHost for bookmark feedback — tapping the bookmark icon (on either Home cards or the Post screen) fires "Added to bookmarks" / "Removed from bookmarks".
• AlertDialog replacing the share NoOp — "Share article" / "Functionality not available 😞" / Cancel + Share anyway, with Share anyway routing to Intent.ACTION_SEND.
• Inline OutlinedTextField search swap — tapping the magnifier in the home top bar replaces the wordmark with a "Search JetNews" field; close (X) icon reverts. Wiring the field to actually filter the feed still needs Modifier.interceptKey(Key.Enter) (left on this tracker).
• Intent.ACTION_SEND share helper — MainActivity.SharePost builds an Intent.ACTION_SEND with the post title + a synthetic developer.android.com/jetnews/post/{id} URL, wraps it in Intent.CreateChooser, and surfaces an ActivityNotFoundException fallback via the snackbar.

This tracker stays open for the harder items (Navigation 3, SharedTransitionLayout, deep links, Modifier.interceptKey, Glance widget, stringResource rework) which need library work.