Don't allow resizing of new dialog.

src/plugins/coreplugin/dialogs/newdialog.ui

@@ -10,10 +10,19 @@
     <height>390</height>
    </rect>
   </property>
+  <property name="sizePolicy">
+   <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+    <horstretch>0</horstretch>
+    <verstretch>0</verstretch>
+   </sizepolicy>
+  </property>
   <property name="windowTitle">
    <string>New Project</string>
   </property>
   <layout class="QGridLayout" name="gridLayout">
+   <property name="sizeConstraint">
+    <enum>QLayout::SetFixedSize</enum>
+   </property>
    <item row="3" column="1">
     <widget class="QTextBrowser" name="templateDescription">
      <property name="sizePolicy">
@@ -95,9 +104,6 @@
      <attribute name="headerVisible">
       <bool>false</bool>
      </attribute>
-     <attribute name="headerVisible">
-      <bool>false</bool>
-     </attribute>
     </widget>
    </item>
   </layout>