Bug 16181 Tab key doesn't work in editor when 'Insert spaces for tabs' enabled
Using integration build 0515, pressing Tab in an editor window doesn't do anything when 'Insert spaces for tabs' is selected. The editor is marked as unsaved, but no spaces appear.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitEditor.java
Control control= getControl();
			if (control instanceof Composite) {
				Composite composite= (Composite) control;
				composite.layout();
			}
		}
		
		public void showOverviewRuler() {
			fIsOverviewRulerVisible= true;
			Control control= getControl();
			if (control instanceof Composite) {
				Composite composite= (Composite) control;
				composite.layout();
			}
		}
		
		public boolean isOverviewRulerVisible() {
			return fIsOverviewRulerVisible;
		}
		
		/*
		 * @see ISourceViewer#setDocument(IDocument, IAnnotationModel, int, int)
		 */
		public void setDocument(IDocument document, IAnnotationModel annotationModel, int visibleRegionOffset, int visibleRegionLength) {
			super.setDocument(document, annotationModel, visibleRegionOffset, visibleRegionLength);
			fOverviewRuler.setModel(annotationModel);
		}
	};
	
	static class TabConverter implements ITextConverter {