Would like Ground Grid to Match Size of Floor Size

[br3ttman]

Just playing with some of the fun new features in 3.1  when I went to resize the ground size.  I can see it get smaller based on shadows from my object getting clipped.  It was kind of hard to visualize, though, so I checked if the ground grid also changed in size for a faster reference.  It doesn't, so I thought that might be a nice feature.