Implement blacklisting from verification key popup

src/backend/matrix_client.py

@@ -1331,6 +1331,11 @@ class MatrixClient(nio.AsyncClient):
         self.verify_device(self.olm.device_store[user_id][device_id])
 
 
+    async def blacklist_device_id(self, user_id: str, device_id: str) -> None:
+        """Mark a device as blacklisted."""
+
+        self.blacklist_device(self.olm.device_store[user_id][device_id])
+
 
     # Functions to register/modify data into models
 

src/gui/Pages/AccountSettings/DeviceDelegate.qml

@@ -14,6 +14,7 @@ HTile {
     property string userId
 
     signal verified()
+    signal blacklisted()
     signal renameRequest(string name)
 
 
@@ -157,6 +158,7 @@ HTile {
                                 ed25519Key: model.ed25519_key,
                                 deviceIsCurrent: model.type === "current",
                                 verifiedCallback: deviceTile.verified,
+                                blacklistedCallback: deviceTile.blacklisted,
                             },
                         )
                     }

src/gui/Pages/AccountSettings/Sessions.qml

@@ -80,6 +80,7 @@ HColumnPage {
             view: deviceList
             userId: page.userId
             onVerified: page.loadDevices()
+            onBlacklisted: page.loadDevices()
             onRenameRequest: name => renameDevice(model.index, name)
         }
 

src/gui/Popups/KeyVerificationPopup.qml

@@ -16,6 +16,7 @@ HFlickableColumnPopup {
     property string ed25519Key
     property bool deviceIsCurrent: false
     property var verifiedCallback: null
+    property var blacklistedCallback: null
 
 
     page.footer: ButtonLayout {
@@ -43,8 +44,17 @@ HFlickableColumnPopup {
             text: qsTr("They differ")
             icon.name: "device-blacklisted"
             onClicked: {
-                // XXX
+                loading = true
-                popup.close()
+
+                py.callClientCoro(
+                    userId,
+                    "blacklist_device_id",
+                    [deviceOwner, deviceId],
+                    () => {
+                        if (blacklistedCallback) blacklistedCallback()
+                        popup.close()
+                    }
+                )
             }
         }