Fix popup font resizing on macOS

app/gui/AutoResizingComboBox.qml

@@ -3,25 +3,29 @@ import QtQuick.Controls 2.2
 
 // https://stackoverflow.com/questions/45029968/how-do-i-set-the-combobox-width-to-fit-the-largest-item
 ComboBox {
-    property int modelWidth
+    property int comboBoxWidth
 
-    width: modelWidth + 2*leftPadding + 2*rightPadding
+    width: comboBoxWidth + 2*leftPadding + 2*rightPadding
+
+    TextMetrics {
+        id: popupMetrics
+        font: popup.font
+    }
 
     TextMetrics {
         id: textMetrics
         font: parent.font
     }
 
-    onFontChanged: {
-        textMetrics.font = font
-    }
-
     // We call this every time the options change (and init)
     // so we can adjust the combo box width here too
     onActivated: {
+        comboBoxWidth = 0
         for (var i = 0; i < count; i++){
             textMetrics.text = textAt(i)
-            modelWidth = Math.max(textMetrics.width, modelWidth)
+            popupMetrics.text = textAt(i)
+            comboBoxWidth = Math.max(textMetrics.width, comboBoxWidth)
+            comboBoxWidth = Math.max(popupMetrics.width, comboBoxWidth)
         }
     }
 }