[data grid] Simplify --width property indirection with width

[oliviertassinari]

I'm opening this issue as a potential low priority opportunity to improve the row width management.

We use a --width CSS variables indirection to set the width of the rows https://github.com/search?q=repo%3Amui%2Fmui-x+--width+path%3A%2F%5Epackages%5C%2Fx-data-grid%2F&type=code but there doesn't seem to be a good reason to do such.

Instead, it seems that modifying the width style properly directly would be:

• simpler, no indication
• a bit more performant

This was discovered in #14776. Now, this doesn't seem to be a major concern, more of a low-hanging fruit. I doubt it will make column resizing much more performant, nor that there is a major performance win to gain so a low priority.

Search keywords: