AbstractInformationControl: return the shell where the content compos…

…ite is

in some cases, the original shell is being replaced by the child classes

a good example is in CompositeInformationControl, in createContent() where it collects all the controls of the AbstractInformationControl and sets a different parent to it

see issue: [eclipse-platform#2242](eclipse-platform#2242)

bundles/org.eclipse.jface.text/src/org/eclipse/jface/text/AbstractInformationControl.java

@@ -433,7 +433,25 @@ private static void setColor(Control control, Color foreground, Color background
 	 * @since 3.13
 	 */
 	public final Shell getShell() {
-		return fShell;
+		return fContentComposite.getShell();
+	}
+
+	/**
+	* The composite containing the content created by subclasses.
+	*
+	* @return the content composite
+	*/
+	protected final Composite getContentComposite() {
+		return fContentComposite;
+	}
+
+	/**
+ 	* Composite containing the status line content.
+	*
+	* @return the status composite or <code>null</code> if none
+	*/
+	protected final Composite getStatusComposite() {
+		return fStatusComposite;
 	}
 
 	/**