DrawingTool: Add an option to change the background color when resizing the canvas

[Mario Kemper (Romario)]

Gary Richmond:

"Also, re the
canvas tool, is there any way you could add the option to have a
personal, customised background in the extra canvas space with
annotations? The extra space is a really great idea but it would look
so much more "professional" if it could be colour coded too."

[nomnex (nomnex)]

I second that. The checker background does not look good when you have to write text comments.