Bug 20700 Code assist activates help UI
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitEditor.java
fBracketPainter.deactivate(true);
			fBracketPainter.dispose();
			fBracketPainter= null;
		}
	}
	
	private boolean isBracketHighlightingEnabled() {
		IPreferenceStore store= getPreferenceStore();
		return store.getBoolean(MATCHING_BRACKETS);
	}
	
	private void startLineHighlighting() {
		if (fLinePainter == null) {
			ISourceViewer sourceViewer= getSourceViewer();
			fLinePainter= new LinePainter(sourceViewer);
			fLinePainter.setHighlightColor(getColor(CURRENT_LINE_COLOR));
			fPaintManager.addPainter(fLinePainter);
		}
	}
	
	private void stopLineHighlighting() {
		if (fLinePainter != null) {
			fPaintManager.removePainter(fLinePainter);
			fLinePainter.deactivate(true);
			fLinePainter.dispose();
			fLinePainter= null;
		}
	}
	
	private boolean isLineHighlightingEnabled() {