[gnome-builder] testui: copy scrollback-lines from IdeTerminalPage

[Christian Hergert <chergert src gnome org>]

commit 9246f03806694cd5facb18be368c0475f9532189
Author: Christian Hergert <chergert redhat com>
Date:   Fri Apr 26 14:21:09 2019 -0700

    testui: copy scrollback-lines from IdeTerminalPage

 src/plugins/testui/gbp-test-output-panel.ui | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/plugins/testui/gbp-test-output-panel.ui b/src/plugins/testui/gbp-test-output-panel.ui
index 9327c464c..cbd634fd5 100644
--- a/src/plugins/testui/gbp-test-output-panel.ui
+++ b/src/plugins/testui/gbp-test-output-panel.ui
@@ -9,6 +9,7 @@
           <object class="IdeTerminal" id="terminal">
             <property name="audible-bell">false</property>
             <property name="expand">true</property>
+            <property name="scrollback-lines">0xffffffff</property>
             <property name="visible">true</property>
           </object>
         </child>