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gh-157762: Fix Alt-2 zoom height binding in IDLE tree windows #157772

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gh-157762: Fix Alt-2 zoom height binding in IDLE tree windows #157772

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4 changes: 4 additions & 0 deletions Lib/idlelib/idle_test/test_tree.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,10 @@ def test_init(self):
node = tree.TreeNode(sc.canvas, None, item)
node.expand()

def test_zoom_height(self):
sc = tree.ScrolledCanvas(self.root)
self.assertEqual(sc.zoom_height(None), "break")


if __name__ == '__main__':
unittest.main(verbosity=2)
3 changes: 2 additions & 1 deletion Lib/idlelib/tree.py
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Original file line number Diff line number Diff line change
Expand Up @@ -423,6 +423,7 @@ def __init__(self, master, **opts):
if 'yscrollincrement' not in opts:
opts['yscrollincrement'] = 17
self.master = master
self.top = master.winfo_toplevel()
self.frame = Frame(master)
self.frame.rowconfigure(0, weight=1)
self.frame.columnconfigure(0, weight=1)
Expand Down Expand Up @@ -457,7 +458,7 @@ def unit_down(self, event):
self.canvas.yview_scroll(1, "unit")
return "break"
def zoom_height(self, event):
zoomheight.zoom_height(self.master)
zoomheight.ZoomHeight(self).zoom_height()
return "break"


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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/IDLE/2026-09-19-10-30-00.gh-issue-157762.Kv7pQ2.rst
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@@ -0,0 +1,3 @@
Fix the Alt-2 (zoom height) binding in IDLE's tree windows, such as Path
Browser and Module Browser. It called a function removed from
``idlelib.zoomheight`` in 2019 and raised :exc:`AttributeError`.
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