Qt 5.12 ES5 → 7: Use "() =>" and array.includes

src/qml/Chat/Banners/InviteBanner.qml

@@ -35,18 +35,18 @@ Banner {
     ]
 
     buttonCallbacks: {
-        "accept": function(button) {
+        "accept": button => {
             button.loading = true
             py.callClientCoro(
-                chatPage.userId, "join", [chatPage.roomId], function() {
+                chatPage.userId, "join", [chatPage.roomId], () => {
                     button.loading = false
             })
         },
 
-        "decline": function(button) {
+        "decline": button => {
             button.loading = true
             py.callClientCoro(
-                chatPage.userId, "room_leave", [chatPage.roomId], function() {
+                chatPage.userId, "room_leave", [chatPage.roomId], () => {
                     button.loading = false
             })
         }

src/qml/Chat/Banners/LeftBanner.qml

@@ -23,10 +23,10 @@ Banner {
     ]
 
     buttonCallbacks: {
-        "forget": function(button) {
+        "forget": button => {
             button.loading = true
             py.callClientCoro(
-                chatPage.userId, "room_forget", [chatPage.roomId], function() {
+                chatPage.userId, "room_forget", [chatPage.roomId], () => {
                     button.loading = false
             })
         }

src/qml/Chat/Banners/UnknownDevicesBanner.qml

@@ -21,8 +21,8 @@ Banner {
     ]
 
     buttonCallbacks: {
-        "inspect": function(button) {
+        "inspect": button => {
             print("show")
-        },
+        }
     }
 }