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bpo-41306: Allow scale value to not be rounded (GH-21715)

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This fixes the test failure with Tk 6.8.10 which is caused by changes to how Tk rounds the `from`, `to` and `tickinterval` arguments. This PR uses `noconv` if the patchlevel is greater than or equal to 8.6.10 (credit to Serhiy for this idea as it is much simpler than what I previously proposed).

Going into more detail for those who want it, the Tk change was made in [commit 591f68c](591f68cb38) and means that the arguments listed above are rounded relative to the value of `from`. However, when rounding the `from` argument ([line 623](591f68cb38/generic/tkScale.c (L623))), it is rounded relative to itself (i.e. rounding `0`) and therefore the assigned value for `from` is always what is given (no matter what values of `from` and `resolution`).

Automerge-Triggered-By: @pablogsal
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E-Paine 2020-10-08 14:30:13 +01:00 • committed by GitHub
parent 4a9f82f50d
commit aecf036738
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3
Lib/tkinter/test/test_tkinter/test_widgets.py
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@ -940,7 +940,8 @@ def test_digits(self):
def test_from(self): def test_from(self):
widget = self.create() widget = self.create()
self.checkFloatParam(widget, 'from', 100, 14.9, 15.1, conv=float_round) conv = False if get_tk_patchlevel() >= (8, 6, 10) else float_round
self.checkFloatParam(widget, 'from', 100, 14.9, 15.1, conv=conv)
def test_label(self): def test_label(self):
widget = self.create() widget = self.create()

1
Misc/NEWS.d/next/Tests/2020-08-03-13-44-37.bpo-41306.VDoWXI.rst Normal file
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@ -0,0 +1 @@
Fixed a failure in ``test_tk.test_widgets.ScaleTest`` happening when executing the test with Tk 8.6.10.