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
} finally {
			
			if (fragment == null)
				getDocumentProvider().changed(newInput);
				
			if (progressMonitor != null)
				progressMonitor.setCanceled(!success);
		}
	}
	
	/*
	 * @see AbstractTextEditor#doSetInput(IEditorInput)
	 */
	protected void doSetInput(IEditorInput input) throws CoreException {
		super.doSetInput(input);
		configureTabConverter();
	}
	
	private void startBracketHighlighting() {
		if (fBracketPainter == null) {
			ISourceViewer sourceViewer= getSourceViewer();
			fBracketPainter= new BracketPainter(sourceViewer);
			fBracketPainter.setHighlightColor(getColor(MATCHING_BRACKETS_COLOR));
			fPaintManager.addPainter(fBracketPainter);
		}
	}
	
	private void stopBracketHighlighting() {
		if (fBracketPainter != null) {