Support 'when-maximised' for showWholeGraph

^{Originally posted by **9mm** September 16, 2023}
I really love the combined git log graph where it shows a visual of the branches and commits:

```
showGraph: when-maximised
showWholeGraph: true
```

The problem is that when the commits pane is small, i want to see neither a graph, nor all branch commits in one pane

but when its maximized, i want both

currently the showGraph setting works great when maximized, but i when its maximized thats when i want to see all commits together (given the fact that the visual helps you differentiate between them)

Right now i have to set `showWholeGraph` to false becuase its just way too confusing to see mixed in commits with no graph in a tiny window

Is there a way to get

`showWholeGraph` to have the same options as `showGraph`? (ie... `when-maximized`, `always` etc)