This is unclear to me. I feel, we are mixing two things here an it's too short to understand:

1. draw_without_rendering ensures the window_extent is up-to-date for the current transform stack. This resolves incorrect intermediate state due to lazy evalutation, e.g. of the layout.
2. How doessavefig help here? Is this this the double save idea ofBug when saving to vector format (pdf, svg, eps) #2831 (comment). If so, that needs more explanation. Also I'm not sure on the generality of the solutionBug when saving to vector format (pdf, svg, eps) #2831 (comment).

I left a comment over on#2831 for why in the case of vector backends we may need savefig (tl;dr:print_pdf changes the DPI).

I still think this is too terse to be helpful and actionable for users. However, I won't block over this.

Decide yourself whether it's good enough for now or how much additional effort you want to put into this.