Add redacting event via context menu

src/backend/matrix_client.py

@@ -875,6 +875,18 @@ class MatrixClient(nio.AsyncClient):
 
         return (successes, errors)
 
+    async def room_mass_redact(
+        self, room_id: str, reason: str, *event_ids: str,
+    ):
+        """Redact events from a room in parallel.
+
+        Returns a list of sucessful redacts.
+        """
+
+        return await asyncio.gather(*[
+            self.room_redact(room_id, evt_id, reason)
+            for evt_id in event_ids
+        ])
 
     async def generate_thumbnail(
         self, data: UploadData, is_svg: bool = False,

src/gui/Pages/Chat/Timeline/EventDelegate.qml

@@ -218,6 +218,19 @@ HColumnLayout {
             }
         }
 
+        HMenuItemPopupSpawner {
+            icon.name: "remove-message"
+            text: qsTr("Remove")
+
+            popup: "Popups/RedactEvents.qml"
+            popupParent: chat
+            properties: ({
+                userId: chat.userId,
+                roomId: chat.roomId,
+                eventIds: [model.event_id]
+            })
+        }
+
         HMenuItem {
             icon.name: "debug"
             text: qsTr("Debug this event")

src/gui/Popups/RedactEvents.qml

@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+import QtQuick 2.12
+import QtQuick.Layouts 1.12
+import "../Base"
+
+BoxPopup {
+    summary.text:
+        eventIds.length > 1 ?
+        qsTr("Remove selected messages?") :
+        qsTr("Remove selected message?")
+
+    HLabeledTextField {
+        id: reasonField
+        label.text: qsTr("Reason (optional):")
+        Layout.fillWidth: true
+    }
+
+    okText: qsTr("Remove")
+    box.focusButton: "ok"
+
+    onOk: py.callClientCoro(
+        userId,
+        "room_mass_redact",
+        [roomId, reasonField.field.text, ...eventIds]
+    )
+
+    property string roomId: ""
+    property string userId: ""
+
+    property var eventIds: []
+}

src/icons/thin/remove-message.svg

@@ -0,0 +1 @@
+<svg width="24" height="24" xmlns="http://www.w3.org/2000/svg" fill-rule="evenodd" clip-rule="evenodd"><path d="M5.662 23l-5.369-5.365c-.195-.195-.293-.45-.293-.707 0-.256.098-.512.293-.707l14.929-14.928c.195-.194.451-.293.707-.293.255 0 .512.099.707.293l7.071 7.073c.196.195.293.451.293.708 0 .256-.097.511-.293.707l-11.216 11.219h5.514v2h-12.343zm3.657-2l-5.486-5.486-1.419 1.414 4.076 4.072h2.829zm6.605-17.581l-10.677 10.68 5.658 5.659 10.676-10.682-5.657-5.657z"/></svg>