Fix for #3935 - pan-jump when map is large

[olsen232]

When the map canvas is large - >2048px, probably* - the coords canvas stops growing with the map due to web GL limitations. This means that a screen-pixel is no longer 1:1 with a coords-canvas pixel. It needs to be scaled using the ratio of devicePixelRatio and painter.pixelRatio, which are no longer equal when the map is large.

*This might depend on your machine and its willingness to create webgl textures larger than 2048 x 2048.

Fixes #3935

Before / After

before.mp4

after.mp4

Launch Checklist

• Confirm your changes do not include backports from Mapbox projects (unless with compliant license) - if you are not sure about this, please ask!
• Briefly describe the changes in this PR.
• Link to related issues.
• Include before/after visuals or gifs if this PR includes visual changes.
• Write tests for all new functionality.
• Document any changes to public APIs. (N/A)
• Post benchmark scores.
• Add an entry to CHANGELOG.md under the ## main section.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.74%. Comparing base (a5934cb) to head (95667c1).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3940      +/-   ##
==========================================
- Coverage   86.83%   86.74%   -0.10%     
==========================================
  Files         242      242              
  Lines       32479    32482       +3     
  Branches     1977     1993      +16     
==========================================
- Hits        28204    28177      -27     
- Misses       3341     3367      +26     
- Partials      934      938       +4     

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[HarelM]

Looks good! Thanks!
Please add a test and a changelog entry.

[olsen232]

Done