Polishing Settings Ui:

Using default margins. Spacer outside lower Groupbox.

src/plugins/projectexplorer/projectexplorersettingspage.ui

@@ -11,9 +11,6 @@
    </rect>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout_3">
-   <property name="margin">
-    <number>0</number>
-   </property>
    <item>
     <widget class="QGroupBox" name="groupBox">
      <property name="title">
@@ -43,22 +40,22 @@
         </property>
        </widget>
       </item>
-      <item>
-       <spacer name="verticalSpacer">
-        <property name="orientation">
-         <enum>Qt::Vertical</enum>
-        </property>
-        <property name="sizeHint" stdset="0">
-         <size>
-          <width>20</width>
-          <height>40</height>
-         </size>
-        </property>
-       </spacer>
-      </item>
      </layout>
     </widget>
    </item>
+   <item>
+    <spacer name="verticalSpacer">
+     <property name="orientation">
+      <enum>Qt::Vertical</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>20</width>
+       <height>40</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
   </layout>
  </widget>
  <resources/>