Implement session sign out (password auth only)

src/gui/Popups/AuthentificationPopup.qml

@@ -1,25 +0,0 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
-
-import QtQuick 2.12
-import "../Base"
-import "../Base/ButtonLayout"
-
-HFlickableColumnPopup {
-    id: popup
-
-
-    property string userId
-    property string deviceIds
-
-
-    page.footer: ButtonLayout {
-        CancelButton {
-            id: cancelButton
-            onClicked: popup.close()
-        }
-    }
-
-    onOpened: cancelButton.forceActiveFocus()
-
-    SummaryLabel { text: qsTr("Not implemented yet") }
-}

src/gui/Popups/DeleteDevicesPopup.qml

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+import QtQuick 2.12
+import "../Base"
+import "../Base/ButtonLayout"
+
+PasswordPopup {
+    id: popup
+
+
+    property string userId
+    property var deviceIds  // array
+    property var deletedCallback: null
+
+
+    function verifyPassword(pass, callback) {
+        py.callClientCoro(
+            userId,
+            "delete_devices_with_password",
+            [deviceIds, pass],
+            () => callback(true),
+            (type, args) => {
+                callback(
+                    type === "MatrixUnauthorized" ?
+                    false :
+                    qsTr("Unknown error: %1 - %2").arg(type).arg(args)
+                )
+            },
+        )
+    }
+
+    summary.text:
+        qsTr("Enter your account's password to continue:")
+
+
+    validateButton.text: qsTr("Sign out")
+    validateButton.icon.name: "sign-out"
+
+    onClosed: if (acceptedPassword && deletedCallback) deletedCallback()
+}