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/hooks/menu.py

@@ -1,4 +1,5 @@
-""""Edit history" in the message menu itself, right above Forward.
+""""Edit history" (and "Unhide" for a revealed hidden message, see
+hooks/hidden.py) in the message menu itself, right above Forward.
 
 Plugin menu items (MenuItemData) only go into the menu's Plugins folder, and
 exteraGram drops option ids it doesn't know from fillMessageMenu's lists, so
@@ -12,10 +13,12 @@ from base_plugin import MethodHook
 
 import diag
 import store
+from hooks.hidden import is_revealed_hidden
 from jutil import field, hook_methods, java_class
 
 CHAT = "org.telegram.ui.ChatActivity"
-_LABEL = "Edit history"
+_HISTORY = "Edit history"
+_UNHIDE = "Unhide"
 
 
 def _worth_it(message):
@@ -58,9 +61,10 @@ def _find_item(view, text):
 
 
 class Menu:
-    def __init__(self, plugin, open_history):
+    def __init__(self, plugin, open_history, unhide):
         self.plugin = plugin
         self.open_history = open_history
+        self.unhide = unhide  # hooks/hidden.Hidden.unhide
         self.handles = []
         self._close = None
 
@@ -87,39 +91,49 @@ class Menu:
     def add_item(self, chat):
         message = field(chat, "selectedObject")
         popup = field(chat, "scrimPopupWindow")
-        if popup is None or not _worth_it(message):
+        if popup is None or message is None:
             return
-        # The createMenu overloads call one another: add the row once.
-        if _find_item(popup.getContentView(), _LABEL) is not None:
-            return
-        from org.telegram.messenger import LocaleController, R
+        from org.telegram.messenger import R
 
+        rows = []
+        if _worth_it(message):
+            rows.append((_HISTORY, R.drawable.msg_edit, lambda: self.open_history(message)))
+        if is_revealed_hidden(message):
+            rows.append((_UNHIDE, R.drawable.msg_views, lambda: self.unhide([message])))
+        # The createMenu overloads call one another: add the rows once.
         content = popup.getContentView()
+        if not rows or _find_item(content, rows[0][0]) is not None:
+            return
+        from org.telegram.messenger import LocaleController
+
         # Forward is a row in some chats and an icon in the bottom action bar
-        # in others (groups): then the row goes first in the list.
+        # in others (groups): then the rows go first in the list.
         anchor = _find_item(
             content, str(LocaleController.getString(R.string.Forward))
         ) or _first_item(content)
         if anchor is None:
-            diag.log("menu: no row to place Edit history by")
+            diag.log("menu: no row to place the rows by")
             return
-        forward = anchor
+        for label, icon, action in rows:
+            self._add_row(chat, anchor, label, icon, action)
+
+    def _add_row(self, chat, anchor, label, icon, action):
         from android_utils import OnClickListener
         from org.telegram.ui.ActionBar import ActionBarMenuSubItem
 
-        parent = forward.getParent()
-        item = ActionBarMenuSubItem(forward.getContext(), False, False)
-        item.setTextAndIcon(_LABEL, R.drawable.msg_edit)
-        color = forward.getTextView().getCurrentTextColor()
+        parent = anchor.getParent()
+        item = ActionBarMenuSubItem(anchor.getContext(), False, False)
+        item.setTextAndIcon(label, icon)
+        color = anchor.getTextView().getCurrentTextColor()
         item.setColors(color, color)
-        item.setMinimumWidth(forward.getMinimumWidth())
+        item.setMinimumWidth(anchor.getMinimumWidth())
 
         def chosen(_view):
             self._close_menu(chat)
-            self.open_history(message)
+            action()
 
         item.setOnClickListener(OnClickListener(chosen))
-        parent.addView(item, parent.indexOfChild(forward), forward.getLayoutParams())
+        parent.addView(item, parent.indexOfChild(anchor), anchor.getLayoutParams())
 
     def _close_menu(self, chat):
         if self._close is None: