add explicit delays to allow Xvfb time to stablize

pdf2htmlEX/test/runLocalBrowserTests

@@ -18,6 +18,9 @@ ps -ef | grep -v grep | grep Xvfb
 echo "-----------------------------------------------------------"
 echo ""
 
+# add an explicit delay to allow Xvfb to stablize
+sleep 2
+
 # Now we tell the test drivers about this display
 # (Note: you MUST not specify the host!)
 #
@@ -35,6 +38,9 @@ export returnCode=$?
 echo "-----------------------------------------------------------"
 echo ""
 
+# add an explicit delay to allow Xvfb to stablize
+sleep 2
+
 # Now we shutdown the virtual frame buffer
 #
 /sbin/start-stop-daemon             \