ContentGroups can be rendered off screen

[yusinto]

In some cases where the content group width is large and the viewport is small, the content group is rendered off screen. This is common for the left most or right most content groups. See screenshot below. The solution is to detect the left position of the content group prior to rendering it. If the left position is off screen, move it so that it's just on-screen.

[yusinto]

This has been fixed in release v0.2.2