Message Logger: hidden messages on the server, removed chats, old chat photos

- Hidden deleted messages are marked on the server (local marks migrated);
  "Reveal hidden messages" in the chat menu, Unhide in the message menu and
  the selection bar.
- Chats an account lost are reported, listed among its chats again and
  opened read-only with their logged messages, all deleted.
- Logged chat photos: a removed chat's avatar, and in a chat's photos the
  ones it no longer has, translucent with a trash icon in the viewer's
  previews.
- Fix: the deleted-post comments thread is answered locally again.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/views/comments.py

@@ -33,9 +33,9 @@ read_only = set()
 _lock = threading.Lock()
 
 
-def make_read_only(chat):
-    """Swaps a comment screen's input bar for a read-only notice (the app's
-    own bottom overlay, as in chats one can't write to). UI thread."""
+def make_read_only(chat, notice="Viewing deleted comments"):
+    """Swaps a screen's input bar for a read-only notice (the app's own
+    bottom overlay, as in chats one can't write to). UI thread."""
     from android.view import View
 
     from jutil import field
@@ -47,7 +47,12 @@ def make_read_only(chat):
     text = field(chat, "bottomOverlayText")
     if overlay is None or text is None:
         return
-    for name in ("bottomOverlayChatText", "bottomOverlayStartButton", "bottomOverlayProgress"):
+    for name in (
+        "bottomOverlayChat",  # a channel's bar (search, mute/join)
+        "bottomOverlayChatText",
+        "bottomOverlayStartButton",
+        "bottomOverlayProgress",
+    ):
         other = field(chat, name)
         if other is not None:
             other.setVisibility(View.GONE)
@@ -56,12 +61,40 @@ def make_read_only(chat):
     animation = field(chat, "bottomOverlayAnimation")
     if animation is not None:
         animation.cancel()
-    text.setText("Viewing deleted comments")
+    text.setText(notice)
     text.setVisibility(View.VISIBLE)
     overlay.setAlpha(1.0)
     overlay.setVisibility(View.VISIBLE)
 
 
+def answer(account, request):
+    """The response for a getReplies of a thread opened here, else None."""
+    with _lock:
+        thread = _threads.get(int(request.msg_id))
+    if thread is None or thread[0] != int(account):
+        return None
+    _account, _discussion, messages, users, chats = thread
+    from java.util import ArrayList
+    from org.telegram.tgnet import TLRPC
+
+    offset_id = int(request.offset_id or 0)
+    add_offset = int(request.add_offset or 0)
+    picked = [
+        m for m in messages if not offset_id or add_offset < 0 or int(m.id) < offset_id
+    ]
+    response = TLRPC.TL_messages_messages()
+    response.messages = ArrayList()
+    for message in sorted(picked, key=lambda m: -int(m.id)):
+        response.messages.add(message)
+    response.users = ArrayList()
+    for user in users:
+        response.users.add(user)
+    response.chats = ArrayList()
+    for chat in chats:
+        response.chats.add(chat)
+    return response
+
+
 def _peer(controller, marked):
     """TLRPC peer of a Telethon sender id."""
     from hooks.chat import _android_peer_id