changed Splitpane resize behavior of ContentProposal

refs #13
diff --git a/bundles/code/org.eclipse.fx.text.ui/src/org/eclipse/fx/text/ui/contentassist/ContentProposalPopup.java b/bundles/code/org.eclipse.fx.text.ui/src/org/eclipse/fx/text/ui/contentassist/ContentProposalPopup.java
index 1b98114..860e995 100644
--- a/bundles/code/org.eclipse.fx.text.ui/src/org/eclipse/fx/text/ui/contentassist/ContentProposalPopup.java
+++ b/bundles/code/org.eclipse.fx.text.ui/src/org/eclipse/fx/text/ui/contentassist/ContentProposalPopup.java
@@ -240,7 +240,7 @@
 				
 				SplitPane splitty = new SplitPane(this.proposalList, docArea);
 				splitty.setBackground(new Background(new BackgroundFill(Color.TRANSPARENT, CornerRadii.EMPTY, Insets.EMPTY)));
-				
+				SplitPane.setResizableWithParent(this.proposalList, Boolean.FALSE);
 				p.setCenter(splitty);
 				
 				return s;