New submission from Terry J. Reedy:
Test_configdialog 'tests' several integer entry widgets by inserting a digit
and then checking that the new value was sent to changes. However, users may
delete an entry totally and enter a new value. If we associate an IntVar with
the entry widget, int('') is called somewhere in the process, which raises.
(IntVar(root).set('') does not, so the error is somewhere further along. The
test should imitate users by delete and insert.
Note: a deeper problem is attaching a tracer that get called with each
keystroke. Using a StringVar avoids the error when the entry is blanked, but
currently allows non-ints to be saved. A better solution would be to not do
the auto tracing, but use a IntVar and only call var_changed when the user
'leaves' the box, after checking for a count in a sane range.
----------
assignee: terry.reedy
components: IDLE
messages: 301851
nosy: terry.reedy
priority: normal
severity: normal
stage: needs patch
status: open
title: IDLE: Entry tests should delete before insert.
type: behavior
versions: Python 3.6, Python 3.7
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<https://bugs.python.org/issue31414>
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