Fix Retina display issues with ribbon (PR #26409)

[Blake-Madden]

In macOS, there were two issues:

• The area drawn around regular-sized buttons was twice the size it should be.

Screenshot.2026-04-25.at.12.52.33.PM.png (view on web) - Smaller sized buttons would display the icon at the wrong (too large) size. Screenshot.2026-04-25.at.12.53.28.PM.png (view on web)

This PR fixes the size calculation of the button area, bitmap scaling, and implements some dead code with small button sizing.

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You can view, comment on, or merge this pull request online at:

  https://github.com/wxWidgets/wxWidgets/pull/26409

Commit Summary

• 6bd8462 Fix retina display scaling of icons
• 8b2e5ae Implement small button for ribbons

File Changes

(4 files)

• M src/ribbon/art_aui.cpp (3)
• M src/ribbon/art_msw.cpp (17)
• M src/ribbon/art_msw_flat.cpp (3)
• M src/ribbon/buttonbar.cpp (33)

Patch Links:

• https://github.com/wxWidgets/wxWidgets/pull/26409.patch
• https://github.com/wxWidgets/wxWidgets/pull/26409.diff

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