Description:
Resizing columns is currently lacking preview and minimal width.

Steps to Reproduce:
Resize column in calc

Actual Results:
1. no preview is shown to convey to the user what their change will look like.
2. no minimal width is defined allowing (maybe intended, but imo not good UX) to hide column, probably more likely to result in unexpected results and confusion.

Expected Results:
1. showing a preview while users drag column separator left / right would be helpful to show to users what they are chaning and what the results will look like *before* committing to the change.
2. implementing a minimal width and by that preventing unintended hiding of columns.


Reproducible: Always


User Profile Reset: No



Additional Info:
see attached gifs showing behavior of Apple Numbers (exposing proposed #1 and #2) and LibreOffice.

Version: 7.2.0.0.alpha1+ / LibreOffice Community
Build ID: 49af7e22e61c2e5d440ad55cd362388983e128ae
CPU threads: 8; OS: Mac OS X 10.16; UI render: default; VCL: osx
Locale: de-DE (de_DE.UTF-8); UI: en-US
Calc: threaded