Support 'when-maximised' for showWholeGraph

[danmou]

Discussed in https://github.com/jesseduffield/lazygit/discussions/3014

^{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)