Software version (please complete the following information):

• Browser chrome 76.0.3809.132
• Vue Version 2.6.10
• vue-grid-layout Version: 2.3.5 (working fine in 2.3.4)

Describe the bug
In some cases cols will autoresize to 1 col bigger after resize.

To Reproduce
Steps to reproduce the behavior:

1. Instance a grid
2. Add an item and resize it to 6 columns
3. See error (after release mouse button will be resized to 7)

Expected behavior
While resize action the preview looks ok (6 columns) but when i release button it resizes to 7.

Screenshots
while resizing:

After release mouse button:

Additional context
Screen resolution 1920*1200

Maybe the problem is for these piece of code where the col its changed to 7 instead of 6:

// Helper for generating column width
calcColWidth: function calcColWidth() {
var colWidth = (this.containerWidth - this.margin[0] * (this.cols + 1)) / this.cols;