Use let instead of var

src/app/qml/NewPollDialog.qml

@@ -66,7 +66,7 @@ Kirigami.Dialog {
                 id: optionModel
 
                 readonly property bool allValuesSet: {
-                    for( var i = 0; i < optionModel.rowCount(); i++ ) {
+                    for (let i = 0; i < optionModel.rowCount(); i++) {
                         if (optionModel.get(i).optionText.length <= 0) {
                             return false;
                         }
@@ -83,7 +83,7 @@ Kirigami.Dialog {
 
                 function values() {
                     let textValues = []
-                    for( var i = 0; i < optionModel.rowCount(); i++ ) {
+                    for(let i = 0; i < optionModel.rowCount(); i++) {
                         textValues.push(optionModel.get(i).optionText);
                     }
                     return textValues;

src/settings/SelectSpacesDialog.qml

@@ -37,7 +37,7 @@ Kirigami.Dialog {
     standardButtons: Kirigami.Dialog.Ok | Kirigami.Dialog.Cancel
     onAccepted: {
         let ids = [];
-        for (var i in spaceGroup.buttons) {
+        for (let i in spaceGroup.buttons) {
             if (spaceGroup.buttons[i].checked) {
                 ids.push(spaceGroup.buttons[i].modelData.id);
             }

src/timeline/DelegateContextMenu.qml

@@ -126,7 +126,7 @@ KirigamiComponents.ConvergentContextMenu {
 
                     onClicked: {
                         if (emojiText.text === "⋮") {
-                            var dialog = emojiDialog.createObject(emojiDelegate) as EmojiDialog;
+                            let dialog = emojiDialog.createObject(emojiDelegate) as EmojiDialog;
                             dialog.showStickers = false;
                             dialog.chosen.connect(emoji => {
                                 root.room.toggleReaction(root.eventId, emoji);