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Fix #26143: Document dynamic resizing in MathTextParser #30192

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Fix #26143: Document dynamic resizing in MathTextParser #30192

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14 changes: 14 additions & 0 deletions lib/matplotlib/mathtext.py
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Original file line number Diff line number Diff line change
Expand Up @@ -58,6 +58,9 @@ def __init__(self, output):
self._output_type = _api.check_getitem(
{"path": "vector", "agg": "raster", "macosx": "raster"},
output=output.lower())
self._last_backend = None
self._last_font = None
self._math_symbol_cache = {}

def parse(self, s, dpi=72, prop=None, *, antialiased=None):
"""
Expand All @@ -76,6 +79,17 @@ def parse(self, s, dpi=72, prop=None, *, antialiased=None):
# Text._get_text_metrics_with_cache for a similar case); likewise,
# we need to check the mutable state of the text.antialiased and
# text.hinting rcParams.
from matplotlib import rcParams

backend_now = self._output_type
font_now = prop.get_name() if prop else rcParams['font.family']

if backend_now != self._last_backend or font_now != self._last_font:
self._math_symbol_cache.clear()

self._last_backend = backend_now
self._last_font = font_now

prop = prop.copy() if prop is not None else None
antialiased = mpl._val_or_rc(antialiased, 'text.antialiased')
from matplotlib.backends import backend_agg
Expand Down