QmlDesigner: Some layout adjustments

Change-Id: Ibf752ff24c1e79629a49061abeb7f87136a7a316
Reviewed-by: Aleksei German <aleksei.german@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

share/qtcreator/qmldesigner/propertyEditorQmlSources/imports/HelperWidgets/ColorEditor.qml

@@ -588,18 +588,8 @@ Column {
             }
         }
 
-        //empty spacer 2
         Item {
-            height: 6
-        }
-
-        Item {
-            height: 6
-        }
-
-        //spacer 3
-        Item {
-            height: 6
+            height: 8
         }
 
         ColorButton {
@@ -622,13 +612,17 @@ Column {
             onClicked: colorEditor.color = colorButton.color
         }
 
-        //empty spacer 4
-        Item { height: 2 }
-        Item { height: 2 }
-
-        //spacer 5
         Item {
-            height: 4
+            height: 1
+        }
+
+        Item {
+            height: 2
+            visible: checkButton.checked
+        }
+
+        Item {
+            height: 1
         }
 
         Item {
@@ -705,8 +699,6 @@ Column {
                     }
                 }
 
-                ExpandingSpacer {
-                }
             }
         }
     }