Grid elements can be resized outside of the bound defined by row option. #2055

Subject of the issue

row setting is not respected and elements can be resized outside of grid bounds defined by row setting.

The bug was introduced in version 6.0.2. The previous one, 6.0.1, seems to be working just fine.

Your environment

• gridstack@6.0.2
• tested on Chrome and Firefox, Ubuntu 20.04

Steps to reproduce

https://jsfiddle.net/pkyjg2sw/
This can be reproduced in two ways:

1. Resize the upper element downward, pushing the bottom one down.
2. Resize the bottom element downward. Might need some wigging with the mouse at the bottom of the screen, but it's also possible.

Expected behavior

Resizing the upper element vertically shouldn't be possible due to fixed rows option

Actual behavior

Resizing is possible, the bottom element is pushed downwards and everything gets out of defined rows bounds.