[FIX] Fix aspect ratio for flat maps

[ymzayek]

• Closes Plotting flat maps + plotting additional data as transparency #2658
• Supercedes and closes [FIX] Fix aspect ratio in surface plotting #2899

Changes proposed in this pull request:

• Fix aspect ratio for plot_surf and view_surf

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.91%. Comparing base (abb80ff) to head (128e3da).
Report is 79 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4184      +/-   ##
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+ Coverage   91.85%   91.91%   +0.05%     
==========================================
  Files         144      145       +1     
  Lines       16419    16708     +289     
  Branches     3434     3552     +118     
==========================================
+ Hits        15082    15357     +275     
+ Misses        792      782      -10     
- Partials      545      569      +24     

Flag	Coverage Δ
macos-latest_3.11_test_plotting	?
macos-latest_3.9_test_plotting	91.74% <100.00%> (?)
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windows-latest_3.9_test_plotting	91.73% <100.00%> (?)

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[ymzayek]

Artifacts link for quick access: https://app.circleci.com/pipelines/github/nilearn/nilearn/10940/workflows/b9b505ca-e58f-45c4-9aa7-11ce2d76b77d/jobs/14134/artifacts

[ymzayek]

Hm from what I understood in the original PR this change shouldn't affect the initial zoom with plotting in standard space with view_surf but it doesn't seem to be the case anymore: e.g. in this example: https://output.circle-artifacts.com/output/job/65338cde-650d-4572-9427-b880f0ca272f/artifacts/0/dev/auto_examples/01_plotting/plot_3d_map_to_surface_projection.html#d-visualization-in-a-web-browser

[ymzayek]

Also in the plot_surf plots the brains become smaller (compare to dev docs from current main: https://nilearn.github.io/dev/auto_examples/01_plotting/plot_3d_map_to_surface_projection.html)

EDIT: fixed in 0ddd103

[ymzayek]

@jeromedockes can you reproduce this https://github.com/nilearn/nilearn/pull/2899/files#r690337773 in this pr?

[ymzayek]

Ok I see, the problem sems to be with view_connectome and view_img_on_surf but not with view_img nor view_surf