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Fixed reference issue in LatexManager #5144

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Fixed reference issue in LatexManager #5144

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26 changes: 13 additions & 13 deletions lib/matplotlib/backends/backend_pgf.py
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Original file line number Diff line number Diff line change
Expand Up @@ -222,19 +222,19 @@ class LatexManagerFactory(object):
def get_latex_manager():
texcommand = get_texcommand()
latex_header = LatexManager._build_latex_header()
prev = LatexManagerFactory.previous_instance

# check if the previous instance of LatexManager can be reused
if prev and prev.latex_header == latex_header and prev.texcommand == texcommand:
if rcParams.get("pgf.debug", False):
print("reusing LatexManager")
return prev
else:
if rcParams.get("pgf.debug", False):
print("creating LatexManager")
new_inst = LatexManager()
LatexManagerFactory.previous_instance = new_inst
return new_inst
if LatexManagerFactory.previous_instance:
prev = LatexManagerFactory.previous_instance()

# check if the previous instance of LatexManager can be reused
if prev and prev.latex_header == latex_header and prev.texcommand == texcommand:
if rcParams.get("pgf.debug", False):
print("reusing LatexManager")
return prev
if rcParams.get("pgf.debug", False):
print("creating LatexManager")
new_inst = LatexManager()
LatexManagerFactory.previous_instance = weakref.ref(new_inst)
return new_inst

class WeakSet(object):
# TODO: Poor man's weakref.WeakSet.
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