KeepInBound issue when viewport size is smaller than the content size

[chepilot]

When the viewport size is smaller than the content size, few issues presented:

• When loaded, the viewport will point to the upper-left corner instead of specified rect
• Panning to somepoint is stuck, you need to further zoom in to further pan.
• There is a drifting behaviour of zooming when zooming out.

[mvindahl]

Hi @chepilot, thanks for reporting and apologies for not responding more promptly. I'll have a look at the issue.

[chozzz]

+1