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fix: Fix unstable tkagg small plot size. #29989

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fix: Fix unstable tkagg small plot size. #29989

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8 changes: 8 additions & 0 deletions lib/matplotlib/backends/_backend_tk.py
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Original file line number Diff line number Diff line change
Expand Up @@ -638,6 +638,14 @@ def __init__(self, canvas, window=None, *, pack_toolbar=True):
window = canvas.get_tk_widget().master
tk.Frame.__init__(self, master=window, borderwidth=2,
width=int(canvas.figure.bbox.width), height=50)
# Avoid message_label expanding the toolbar size, and in turn expanding the
# canvas size.
# Without pack_propagate(False), when the user defines a small figure size
# (e.g. 2x2):
# 1. Figure size that is bigger than the user's expectation.
# 2. When message_label is refreshed by mouse enter/leave, the canvas
# size will also be changed.
self.pack_propagate(False)

self._buttons = {}
for text, tooltip_text, image_file, callback in self.toolitems:
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