Using containInBoundaries causes panes to stop drag far away from edges during quick drags

[ChronosSF]

Description

This likely happens because during drag the handler is cancelled when it would cause the window to be outside. Instead a maximum drag position at that axis should be applied so that the drag doesn't stop at a weird position even when dragging quickly with the mouse.

• version: 1.14.1
• browser: NA

Steps to reproduce

1. Open the new SB sample about the feature
2. Grab a window with the mouse and try to quickly drag it to an edge.
3. ...

Result

The drag abruptly stops very far away from the edge.

Expected result

The drag should stop when the edges are basically one on top of the other.