Added minimal size for widgets. Splitter childrens are not collapsible

resources/forms/documents.ui

@@ -40,8 +40,15 @@
      <property name="lineWidth">
       <number>0</number>
      </property>
-     <layout class="QHBoxLayout" name="horizontalLayout">
+     <layout class="QVBoxLayout" name="verticalLayout_4">
       <item>
+       <widget class="QSplitter" name="splitter">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+        <property name="childrenCollapsible">
+         <bool>false</bool>
+        </property>
         <widget class="QFrame" name="topLeftFrame">
          <property name="sizePolicy">
           <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
@@ -65,11 +72,17 @@
           <item>
            <widget class="UBDocumentTreeWidget" name="documentTreeWidget">
             <property name="sizePolicy">
-            <sizepolicy hsizetype="Maximum" vsizetype="Expanding">
+             <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
               <horstretch>0</horstretch>
               <verstretch>0</verstretch>
              </sizepolicy>
             </property>
+            <property name="minimumSize">
+             <size>
+              <width>250</width>
+              <height>0</height>
+             </size>
+            </property>
             <property name="styleSheet">
              <string notr="true"/>
             </property>
@@ -103,8 +116,6 @@
           </item>
          </layout>
         </widget>
-      </item>
-      <item>
         <widget class="QWidget" name="topRightFrame" native="true">
          <property name="styleSheet">
           <string notr="true"/>
@@ -115,6 +126,12 @@
           </property>
           <item>
            <widget class="UBDocumentThumbnailWidget" name="thumbnailWidget">
+            <property name="minimumSize">
+             <size>
+              <width>250</width>
+              <height>0</height>
+             </size>
+            </property>
             <property name="contextMenuPolicy">
              <enum>Qt::NoContextMenu</enum>
             </property>
@@ -224,6 +241,7 @@
           </item>
          </layout>
         </widget>
+       </widget>
       </item>
      </layout>
     </widget>
@@ -243,8 +261,6 @@
    <header>gui/UBDocumentTreeWidget.h</header>
   </customwidget>
  </customwidgets>
- <resources>
+ <resources/>
-  <include location="../OpenBoard.qrc"/>
- </resources>
  <connections/>
 </ui>