Better formatting for D&D designer dialog

Author: pcav

src/ui/qgsfieldspropertiesbase.ui

@@ -205,10 +205,13 @@
              <property name="orientation">
               <enum>Qt::Vertical</enum>
              </property>
+             <property name="sizeType">
+              <enum>QSizePolicy::Fixed</enum>
+             </property>
              <property name="sizeHint" stdset="0">
               <size>
                <width>20</width>
-               <height>186</height>
+               <height>20</height>
               </size>
              </property>
             </spacer>