diff --git a/kcmkwin/kwinrules/package/contents/ui/FileDialogLoader.qml b/kcmkwin/kwinrules/package/contents/ui/FileDialogLoader.qml
--- a/kcmkwin/kwinrules/package/contents/ui/FileDialogLoader.qml
+++ b/kcmkwin/kwinrules/package/contents/ui/FileDialogLoader.qml
@@ -36,7 +36,7 @@
 
         title: root.title
         selectExisting: !root.isSaveDialog
-        folder: (root.lastFolder == "") ? shortcuts.home : root.lastFolder
+        folder: root.lastFolder || shortcuts.home
         nameFilters: [ i18n("KWin Rules (*.kwinrule)") ]
         defaultSuffix: "*.kwinrule"
 
diff --git a/kcmkwin/kwinrules/package/contents/ui/OptionsComboBox.qml b/kcmkwin/kwinrules/package/contents/ui/OptionsComboBox.qml
--- a/kcmkwin/kwinrules/package/contents/ui/OptionsComboBox.qml
+++ b/kcmkwin/kwinrules/package/contents/ui/OptionsComboBox.qml
@@ -91,7 +91,7 @@
 
         QQC2.ToolTip {
             text: model.tooltip
-            visible: hovered && (model.tooltip != "")
+            visible: hovered && (model.tooltip.length > 0)
         }
 
         Component.onCompleted: {
diff --git a/kcmkwin/kwinrules/package/contents/ui/RuleItemDelegate.qml b/kcmkwin/kwinrules/package/contents/ui/RuleItemDelegate.qml
--- a/kcmkwin/kwinrules/package/contents/ui/RuleItemDelegate.qml
+++ b/kcmkwin/kwinrules/package/contents/ui/RuleItemDelegate.qml
@@ -106,7 +106,7 @@
 
         QQC2.ToolTip {
             text: model.description
-            visible: hovered && (text != "")
+            visible: hovered && (text.length > 0)
         }
     }
 }
diff --git a/kcmkwin/kwinrules/package/contents/ui/RulesEditor.qml b/kcmkwin/kwinrules/package/contents/ui/RulesEditor.qml
--- a/kcmkwin/kwinrules/package/contents/ui/RulesEditor.qml
+++ b/kcmkwin/kwinrules/package/contents/ui/RulesEditor.qml
@@ -154,7 +154,7 @@
                         Layout.alignment: Qt.AlignVCenter
                         QQC2.ToolTip {
                             text: model.description
-                            visible: hovered && (model.description != "")
+                            visible: hovered && (model.description.length > 0)
                         }
                     }
                     QQC2.Label {
@@ -253,7 +253,7 @@
             if (!showItem) {
                 return false;
             }
-            if (filterString != "") {
+            if (filterString.length > 0) {
                 return sourceModel.data(index, RulesModel.NameRole).toLowerCase().includes(filterString)
             }
             return true;
diff --git a/kcmkwin/kwinrules/package/contents/ui/RulesList.qml b/kcmkwin/kwinrules/package/contents/ui/RulesList.qml
--- a/kcmkwin/kwinrules/package/contents/ui/RulesList.qml
+++ b/kcmkwin/kwinrules/package/contents/ui/RulesList.qml
@@ -67,7 +67,7 @@
         }
 
         Kirigami.PlaceholderMessage {
-            visible: ruleBookView.count == 0
+            visible: ruleBookView.count === 0
             anchors.centerIn: parent
             width: parent.width - (units.largeSpacing * 4)
             text: i18n("No rules for specific windows are currently set");
@@ -84,7 +84,7 @@
                 iconName: "object-select-symbolic"
                 text: checked ? i18n("Unselect All") : i18n("Select All")
                 checkable: true
-                checked: selectedIndexes.length == ruleBookView.count
+                checked: selectedIndexes.length === ruleBookView.count
                 onToggled: {
                     if (checked) {
                         selectedIndexes = [...Array(ruleBookView.count).keys()]