Replace AccessibilityDelegateCompat with ViewCompat.addAccessibilityAction for link actions

The previous AccessibilityDelegateCompat approach had two fatal flaws:
1. The delegate was only set when isTouchExplorationEnabled() returned
   true AT BIND TIME — a timing bug that caused TalkBack to see no
   actions if the view was bound before TalkBack fully initialised.
2. Even when set, the delegate/custom-action-ID approach did not
   reliably produce an "Actions" submenu in the TalkBack local context
   menu on Android 14+.

Replace the entire mechanism with ViewCompat.addAccessibilityAction(),
the modern API (androidx.core 1.5.0+) that TalkBack always surfaces
under "Actions". Actions are registered unconditionally at bind time;
stale actions from recycled views are removed via
ViewCompat.removeAccessibilityAction() before re-registration.

Delete the now-unused LinkAccessibilityDelegate class.

Agent-Logs-Url: https://github.com/ArcaneChat/android/sessions/95854760-c8e5-43d8-b7b4-55879a7c5dea

Co-authored-by: adbenitez <24558636+adbenitez@users.noreply.github.com>

src/main/java/org/thoughtcrime/securesms/ConversationItem.java

@@ -23,6 +23,7 @@ import android.graphics.Color;
 import android.graphics.PorterDuff;
 import android.graphics.Rect;
 import android.text.Spannable;
+import android.text.Spanned;
 import android.text.TextUtils;
 import android.util.AttributeSet;
 import android.util.Log;
@@ -36,6 +37,7 @@ import androidx.annotation.DimenRes;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AlertDialog;
+import androidx.core.view.ViewCompat;
 
 import com.b44t.messenger.DcChat;
 import com.b44t.messenger.DcContact;
@@ -66,6 +68,7 @@ import org.thoughtcrime.securesms.mms.VcardSlide;
 import org.thoughtcrime.securesms.reactions.ReactionsConversationView;
 import org.thoughtcrime.securesms.recipients.Recipient;
 import org.thoughtcrime.securesms.util.Linkifier;
+import org.thoughtcrime.securesms.util.LongClickCopySpan;
 import org.thoughtcrime.securesms.util.LongClickMovementMethod;
 import org.thoughtcrime.securesms.util.MarkdownUtil;
 import org.thoughtcrime.securesms.util.MediaUtil;
@@ -73,6 +76,7 @@ import org.thoughtcrime.securesms.util.Util;
 import org.thoughtcrime.securesms.util.ViewUtil;
 import org.thoughtcrime.securesms.util.views.Stub;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Set;
 
@@ -125,6 +129,9 @@ public class ConversationItem extends BaseConversationItem
   private           Stub<VcardView>                 vcardViewStub;
   private           Stub<CallItemView>              callViewStub;
   private @Nullable EventListener                   eventListener;
+  // IDs of accessibility actions registered via ViewCompat.addAccessibilityAction, kept so they
+  // can be removed on rebind (RecyclerView reuses views for different messages).
+  private final List<Integer> linkActionIds = new ArrayList<>();
 
   private int measureCalls;
 
@@ -413,6 +420,13 @@ public class ConversationItem extends BaseConversationItem
     bodyText.setClickable(false);
     bodyText.setFocusable(false);
 
+    // Remove any link actions registered for the previous message binding.
+    // RecyclerView reuses views, so stale actions from a previous item must be cleared.
+    for (int id : linkActionIds) {
+      ViewCompat.removeAccessibilityAction(this, id);
+    }
+    linkActionIds.clear();
+
     String subject = messageRecord.getSubject();
     String text = messageRecord.getText();
 
@@ -428,6 +442,31 @@ public class ConversationItem extends BaseConversationItem
       }
       bodyText.setText(spannable);
       bodyText.setVisibility(View.VISIBLE);
+
+      // Register a TalkBack "Actions" entry for each link in the message.
+      // ViewCompat.addAccessibilityAction is used instead of an AccessibilityDelegateCompat because
+      // it is the modern, reliable API (available since androidx.core 1.5.0) that TalkBack always
+      // surfaces under the "Actions" submenu of the local context menu (L-gesture).
+      // The actions are registered unconditionally — no isTouchExplorationEnabled() guard — because
+      // the registration is cheap and the guard was a source of timing bugs at bind time.
+      // Links are only present when not in batch-selection mode (Linkifier is not called in that
+      // branch above), so no actions are added in batch-selection mode.
+      if (spannable instanceof Spanned) {
+        Spanned spanned = (Spanned) spannable;
+        final TextView tv = bodyText;
+        for (LongClickCopySpan span : spanned.getSpans(0, spanned.length(), LongClickCopySpan.class)) {
+          int start = spanned.getSpanStart(span);
+          int end   = spanned.getSpanEnd(span);
+          if (start >= 0 && end > start && end <= spanned.length()) {
+            String linkText = spanned.subSequence(start, end).toString();
+            String label = context.getString(R.string.accessibility_link_action, linkText);
+            linkActionIds.add(ViewCompat.addAccessibilityAction(this, label, (v, args) -> {
+              span.onClick(tv);
+              return true;
+            }));
+          }
+        }
+      }
     }
 
     int downloadState = messageRecord.getDownloadState();

src/main/res/values/strings.xml

@@ -1179,6 +1179,9 @@
     <string name="perm_enable_bg_reminder_title">Tap here to receive messages while Delta Chat is in the background.</string>
     <string name="perm_enable_bg_already_done">You already allowed Delta Chat to receive messages in the background.\n\nIf messages still do not arrive in background, please also check your system settings.</string>
 
+    <!-- Accessibility -->
+    <string name="accessibility_link_action">Open link: %1$s</string>
+
     <!-- device messages for updates -->
     <string name="update_2_0">What\'s new?\n\n💯 End-to-end encryption is reliable and forever now. Padlocks 🔒 are gone!\n\n✉️ Classic email without end-to-end encryption is marked with a letter symbol\n\n😻 New enhanced profile screen for all your contacts\n\n🔲 New button for quick access to apps used in a chat\n\n❤️ Please donate to help us remain independent and continue to bring improvements: %1$s</string>
 </resources>