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Add tests for Issue #493: PDF output with linewidth=0 #626

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This PR adds two tests to verify rendering behavior when using linewidth=0 in Basemap plots:

test_lines_zero_width.py: ensures lines still render without visual corruption. test_pdf_output.py: checks that PDF output remains compatible across viewers like Adobe and Okular.

Fixes #493.

Cdiaz1234 and others added 17 commits April 9, 2025 02:53
…nsin to 6 decimal places for cleaner output
Fixed in issue that the input data clipping causes when warping an existing map to a hammer map. The clipping of the data confuses the bluemarble method when it tries to draw the background. Removing the call the bluemarble in logic to warp to a hammer map fixes the plotting
Fixed in issue that the input data clipping causes when warping an existing map to a hammer map. The clipping of the data confuses the bluemarble method when it tries to draw the background. Removing the call the bluemarble in logic to warp to a hammer map fixes the plotting
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Flawed PDF save when using linewidth=0 in drawparallels() and drawmeridians()
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