tdf#143720 treeview not expanding vertically to fill space

use a simpler box instead of a grid here and it works out ok vertically

Change-Id: I14fd05b25b00f79b115c041a8e9f5c7ebcf49419
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/133949
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/sw/uiconfig/swriter/ui/assignstylesdialog.ui b/sw/uiconfig/swriter/ui/assignstylesdialog.ui
index 7c677e67..f3d5326 100644
--- a/sw/uiconfig/swriter/ui/assignstylesdialog.ui
+++ b/sw/uiconfig/swriter/ui/assignstylesdialog.ui
@@ -165,15 +165,15 @@
            <property name="label-xalign">0</property>
            <property name="shadow-type">none</property>
            <child>
              <!-- n-columns=1 n-rows=2 -->
              <object class="GtkGrid" id="grid1">
              <object class="GtkBox" id="grid1">
                <property name="visible">True</property>
                <property name="can-focus">False</property>
                <property name="margin-start">12</property>
                <property name="margin-top">6</property>
                <property name="hexpand">True</property>
                <property name="vexpand">True</property>
                <property name="row-spacing">6</property>
                <property name="orientation">vertical</property>
                <property name="spacing">6</property>
                <child>
                  <!-- n-columns=1 n-rows=1 -->
                  <object class="GtkGrid" id="grid2">
@@ -239,8 +239,9 @@
                    </child>
                  </object>
                  <packing>
                    <property name="left-attach">0</property>
                    <property name="top-attach">1</property>
                    <property name="expand">False</property>
                    <property name="fill">True</property>
                    <property name="position">1</property>
                  </packing>
                </child>
                <child>
@@ -447,8 +448,9 @@
                    </child>
                  </object>
                  <packing>
                    <property name="left-attach">0</property>
                    <property name="top-attach">0</property>
                    <property name="expand">True</property>
                    <property name="fill">True</property>
                    <property name="position">0</property>
                  </packing>
                </child>
              </object>