Ensure list box resizes with window

multiselectwidget.ui

@@ -19,6 +19,9 @@
      <property name="orientation">
       <enum>Qt::Horizontal</enum>
      </property>
+     <property name="sizeType">
+      <enum>QSizePolicy::Maximum</enum>
+     </property>
      <property name="sizeHint" stdset="0">
       <size>
        <width>10</width>
@@ -178,6 +181,9 @@
      <property name="orientation">
       <enum>Qt::Horizontal</enum>
      </property>
+     <property name="sizeType">
+      <enum>QSizePolicy::Maximum</enum>
+     </property>
      <property name="sizeHint" stdset="0">
       <size>
        <width>10</width>