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TST: Fix pdf_use14corefonts by manually splitting lines
Since Helvetica may or may not be installed, the line height measurement may differ between systems, so multi-line text as in this test may change. This test doesn't care about line heights, but is about using PDF's "standard" fonts, so we'll just manually place the lines.
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‎lib/matplotlib/tests/baseline_images/test_backend_pdf/pdf_use14corefonts.pdf‎

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‎lib/matplotlib/tests/test_backend_pdf.py‎

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@@ -32,13 +32,16 @@ def test_use14corefonts():
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text = '''A three-line text positioned just above a blue line
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and containing some French characters and the euro symbol:
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"Merci pépé pour les 10 €"'''
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"Merci pépé pour les 10 €"'''.splitlines()
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fig, ax = plt.subplots()
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ax.set_title('Test PDF backend with option use14corefonts=True')
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ax.text(0.5, 0.5, text, horizontalalignment='center',
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verticalalignment='bottom',
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fontsize=14)
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for i, line in enumerate(reversed(text)):
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# As Helvetica may or may not be installed, we place these lines manually, or
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# else they will move vertically depending on which font we measure for its
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# line height.
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ax.text(0.5, 0.5 + i * 0.05, line, fontsize=14,
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horizontalalignment='center', verticalalignment='bottom')
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ax.axhline(0.5, linewidth=0.5)
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