Check if the current scroll value is NaN and convert that to 0.0

fixes #44

Change-Id: I1c33332ccdfe9d7f8362e59ddc38b57c673664e2

bundles/runtime/org.eclipse.fx.ui.controls/src/org/eclipse/fx/ui/controls/styledtext/internal/ContentView.java

diff --git a/bundles/runtime/org.eclipse.fx.ui.controls/src/org/eclipse/fx/ui/controls/styledtext/internal/ContentView.java b/bundles/runtime/org.eclipse.fx.ui.controls/src/org/eclipse/fx/ui/controls/styledtext/internal/ContentView.java
index 64cfd3c..9acd9f3 100644
--- a/bundles/runtime/org.eclipse.fx.ui.controls/src/org/eclipse/fx/ui/controls/styledtext/internal/ContentView.java
+++ b/bundles/runtime/org.eclipse.fx.ui.controls/src/org/eclipse/fx/ui/controls/styledtext/internal/ContentView.java
@@ -740,6 +740,9 @@
 	@Override

 	protected void layoutChildren() {

 		double scrollX = -this.offsetX.get();

+		if( Double.isNaN(scrollX) ) {

+			scrollX = 0.0;

+		}

 		this.contentBody.resizeRelocate(scrollX, 0, computeLongestLine(), getHeight());

 	}