Python implementation of account collapsing

src/backend/backend.py

@@ -284,6 +284,11 @@ class Backend:
         history  = await self.history.read()
         theme    = await Theme(self, settings["theme"]).read()
 
+        state_data = self.ui_state._data
+        if state_data:
+            for user, collapse in state_data["collapseAccounts"].items():
+                self.models["all_rooms"].set_account_collapse(user, collapse)
+
         return (settings, ui_state, history, theme)
 
 
@@ -320,3 +325,7 @@ class Backend:
             raise TypeError("model_id must point to a FieldSubstringFilter")
 
         model.filter = value
+
+
+    async def set_account_collapse(self, user_id: str, collapse: bool) -> None:
+        self.models["all_rooms"].set_account_collapse(user_id, collapse)

src/backend/models/special_models.py

@@ -1,9 +1,10 @@
 # SPDX-License-Identifier: LGPL-3.0-or-later
 
 from dataclasses import asdict
+from typing import Set
 
 from .filters import FieldSubstringFilter, ModelFilter
-from .items import Account, AccountOrRoom
+from .items import Account, AccountOrRoom, Room
 from .model import Model
 from .model_item import ModelItem
 
@@ -13,6 +14,21 @@ class AllRooms(FieldSubstringFilter):
         super().__init__(sync_id="all_rooms", fields=("display_name",))
         self.items_changed_callbacks.append(self.refilter_accounts)
 
+        self._collapsed: Set[str] = set()
+
+
+    def set_account_collapse(self, user_id: str, collapsed: bool) -> None:
+        def only_if(item):
+            return item.type is Room and item.for_account == user_id
+
+        if collapsed and user_id not in self._collapsed:
+            self._collapsed.add(user_id)
+            self.refilter(only_if)
+
+        if not collapsed and user_id in self._collapsed:
+            self._collapsed.remove(user_id)
+            self.refilter(only_if)
+
 
     def accept_source(self, source: Model) -> bool:
         return source.sync_id == "accounts" or (
@@ -27,9 +43,16 @@ class AllRooms(FieldSubstringFilter):
 
 
     def accept_item(self, item: ModelItem) -> bool:
+        assert isinstance(item, AccountOrRoom)  # nosec
+
+        if not self.filter and \
+           item.type is Room and \
+           item.for_account in self._collapsed:
+            return False
+
         matches_filter = super().accept_item(item)
 
-        if item.type is not Account or not self.filter:  # type: ignore
+        if item.type is not Account or not self.filter:
             return matches_filter
 
         return next(
@@ -38,9 +61,7 @@ class AllRooms(FieldSubstringFilter):
 
 
     def refilter_accounts(self) -> None:
-        self.refilter(
-            lambda i: isinstance(i, AccountOrRoom) and i.type is Account,
-        )
+        self.refilter(lambda i: i.type is Account)  # type: ignore
 
 
 class MatchingAccounts(ModelFilter):

src/gui/MainPane/Account.qml

@@ -116,6 +116,8 @@ HTileDelegate {
     function setCollapse(collapse) {
         window.uiState.collapseAccounts[model.id] = collapse
         window.uiStateChanged()
+
+        py.callCoro("set_account_collapse", [model.id, collapse])
     }
 
     function toggleCollapse() {