[add] save and open strokes for UI elements · InkCanvas/Ink-Canvas-Artistry@6a1bda8

The field 'MainWindow.isPresentationHaveBlackSpace' is assigned but its value is never used

The field 'MainWindow.isPresentationHaveBlackSpace' is assigned but its value is never used

The field 'MainWindow.isPresentationHaveBlackSpace' is assigned but its value is never used

The field 'MainWindow.isPresentationHaveBlackSpace' is assigned but its value is never used

The field 'MainWindow.isPresentationHaveBlackSpace' is assigned but its value is never used

The field 'MainWindow.isPresentationHaveBlackSpace' is assigned but its value is never used

Provide feedback