Add message context menu entry to clear events

TODO.md

@@ -11,6 +11,7 @@
   - When qml syntax highlighting supports ES6 string interpolation, use that
 
 - Fixes
+  - Quote newline spacing
   - 256 min width when a non-image link preview is present
   - Pressing backspace in composer sometimes doesn't work
   - Message order isn't preserved when sending a first message in a E2E

src/icons/thin/clear-messages.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M11 6.999c2.395.731 4.27 2.607 4.999 5.001.733-2.395 2.608-4.269 5.001-5-2.393-.731-4.268-2.605-5.001-5-.729 2.394-2.604 4.268-4.999 4.999zm7 7c1.437.438 2.562 1.564 2.999 3.001.44-1.437 1.565-2.562 3.001-3-1.436-.439-2.561-1.563-3.001-3-.437 1.436-1.562 2.561-2.999 2.999zm-6 5.501c1.198.365 2.135 1.303 2.499 2.5.366-1.198 1.304-2.135 2.501-2.5-1.197-.366-2.134-1.302-2.501-2.5-.364 1.197-1.301 2.134-2.499 2.5zm-6.001-12.5c-.875 2.873-3.128 5.125-5.999 6.001 2.876.88 5.124 3.128 6.004 6.004.875-2.874 3.128-5.124 5.996-6.004-2.868-.874-5.121-3.127-6.001-6.001z"/></svg>

src/python/matrix_client.py

@@ -64,6 +64,7 @@ class MatrixClient(nio.AsyncClient):
         self.past_tokens:          Dict[str, str] = {}     # {room_id: token}
         self.fully_loaded_rooms:   Set[str]       = set()  # {room_id}
         self.loaded_once_rooms:    Set[str]       = set()  # {room_id}
+        self.cleared_events_rooms: Set[str]       = set()  # {room_id}
 
         self.local_echoes_uuid: Set[str]       = set()
         self.resolved_echoes:   Dict[str, str] = {}  # {event_id: echo_uuid}
@@ -225,7 +226,9 @@ class MatrixClient(nio.AsyncClient):
 
 
     async def load_past_events(self, room_id: str) -> bool:
-        if room_id in self.fully_loaded_rooms or room_id in self.invited_rooms:
+        if room_id in self.fully_loaded_rooms or \
+           room_id in self.invited_rooms or \
+           room_id in self.cleared_events_rooms:
             return False
 
         await self.first_sync_done.wait()
@@ -379,6 +382,13 @@ class MatrixClient(nio.AsyncClient):
                             await asyncio.coroutine(cb.func)(room, decrypted)
 
 
+    async def clear_events(self, room_id: str) -> None:
+        self.cleared_events_rooms.add(room_id)
+        model = self.models[Event, self.user_id, room_id]
+        model.clear()
+        model.sync_now()
+
+
     # Functions to register data into models
 
     async def event_is_past(self, ev: Union[nio.Event, Event]) -> bool:

src/qml/Chat/Timeline/EventDelegate.qml

@@ -6,7 +6,6 @@ import "../../utils.js" as Utils
 Column {
     id: eventDelegate
     width: eventList.width
-
     topPadding:
         model.event_type == "RoomCreateEvent" ? 0 :
         dayBreak  ? theme.spacing * 4 :
@@ -125,6 +124,14 @@ Column {
                 Utils.copyToClipboard(selectableLabelContainer.joinedSelection)
         }
 
+        HMenuItem {
+            icon.name: "clear-messages"
+            text: qsTr("Clear messages")
+            onTriggered: py.callClientCoro(
+                chatPage.userId, "clear_events", [chatPage.roomId],
+            )
+        }
+
         HMenuItem {
             icon.name: "settings"
             text: qsTr("Set as debug console target")

src/qml/Chat/Timeline/EventList.qml

@@ -177,7 +177,7 @@ Rectangle {
     }
 
     HNoticePage {
-        text: qsTr("No messages visible yet")
+        text: qsTr("No messages to show yet")
 
         visible: eventList.model.count < 1
         anchors.fill: parent