feat: improve handling of "Anki already open, or media currently syncing"

[david-allison]

Note

Assisted-by: Claude Fable 5

Purpose / Description

• A user was not given guidance when this occurred
• There was no way to open 'AnkiDroid directory' from these errors

Fixes

• Fixes AnkiWeb login: Anki already open #21051

Approach

• Define a CollectionLockedException, replacing BackendDbLockedException
• Update the string
• Display the error in a dialog
• Add 'Settings' button, opening 'Advanced Settings'

How Has This Been Tested?

Unit tested

Index: AnkiDroid/src/main/java/com/ichi2/anki/DeckPicker.kt
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/AnkiDroid/src/main/java/com/ichi2/anki/DeckPicker.kt b/AnkiDroid/src/main/java/com/ichi2/anki/DeckPicker.kt
--- a/AnkiDroid/src/main/java/com/ichi2/anki/DeckPicker.kt	(revision 36eb6ffad29bfe3db410eae31adc844cc95bac53)
+++ b/AnkiDroid/src/main/java/com/ichi2/anki/DeckPicker.kt	(date 1786802726064)
@@ -510,6 +510,24 @@
 
         setViewBinding(binding)
         enableToolbar()
+
+        // TEMP (#21051): manual testing of the locked-collection dialogs. DO NOT COMMIT
+        // 1. Uncomment the next line, relaunch -> 'Database Locked' startup dialog:
+         CollectionManager.emulatedOpenFailure = CollectionManager.CollectionOpenFailure.LOCKED
+        // 2. Or long-press the toolbar to toggle the lock at runtime, then:
+        //    - tap Sync (or open a deck) -> runtime error dialog
+        //    - Settings - Sync - AnkiWeb account - Log in -> login error dialog
+        // Force-stop the app to clear the emulated lock if the UI becomes unreachable.
+        findViewById<Toolbar>(R.id.toolbar).setOnLongClickListener {
+            CollectionManager.emulatedOpenFailure =
+                if (CollectionManager.emulatedOpenFailure == null) {
+                    CollectionManager.CollectionOpenFailure.LOCKED
+                } else {
+                    null
+                }
+            showThemedToast(this, "emulated lock: ${CollectionManager.emulatedOpenFailure != null}", true)
+            true
+        }
         // TODO This method is run on every activity recreation, which can happen often.
         //  It seems that the original idea was for this to only run once, on app start.
         //  This method triggers backups, sync, and may re-show dialogs

Learning (optional, can help others)

• The error string is hardcoded upstream.
• It is not possible for media syncing to cause this

Checklist

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[github-actions]

Important

Maintainers: This PR contains Strings changes

1. Sync Translations before merging this PR and wait for the action to complete
2. Review and merge the auto-generated PR in order to sync all user-submitted translations
3. Sync Translations again and merge the PR so the huge automated string changes caused by merging this PR are by themselves and easy to review

[mikehardy]

LGTM

Locked-collection UX looks coherent — retype → guidance → Settings→Advanced across startup, runtime, and login. Good improvement for the "Anki already open / media syncing" path.

[david-allison]

@mikehardy pending strings, let's leave this for now

[david-allison]

• if I can fix this in time: Updated strings from Crowdin 2026/09/29 15:56 #22179

[github-actions]

Snapshot diff report vs main. Open screenshot-diff for diffs.

• SharedDecksScreenshotTest: 1 change

All 1 changed screenshots

SharedDecksScreenshotTest

• download_compare.png