IDLE: Test right-click and context menu tests

[BevInTX]

BPO	40819
Nosy	@terryjreedy
Files	copy and cut missing from context menu.png: Copy and Cut Grayed out on selected text context menu

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/terryjreedy'
closed_at = None
created_at = <Date 2020-05-29.16:39:31.699>
labels = ['type-bug', '3.8', '3.9', '3.10', 'expert-IDLE', '3.7']
title = 'IDLE: Test right-click and context menu tests'
updated_at = <Date 2020-05-29.23:01:22.992>
user = 'https://bugs.python.org/BevInTX'

bugs.python.org fields:

activity = <Date 2020-05-29.23:01:22.992>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2020-05-29.16:39:31.699>
creator = 'BevInTX'
dependencies = []
files = ['49202']
hgrepos = []
issue_num = 40819
keywords = []
message_count = 2.0
messages = ['370324', '370338']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'BevInTX']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue40819'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10']

[BevInTX]

In Idle on macOS, when I select text in either the Shell or a file, both copy and cut should be available in the context menu, but they are grayed out (not selectable). Both copy and cut are still available via the menu bar Edit menu and keyboard shortcuts, <command>c and <command>x, respectively. I tried this on macOS El Capitan 10.11.6 and Catalina 10.15.4
[Fixed on another issue - see below. TJR]

[terryjreedy]

Thanks for the report. I verified the context menu defect on Windows and Mac Mohave. The menu and shortcuts still work on both.

This regression was introduced by the first PR for #84066. I mistakenly delayed the fixer, PR-18951, to finish new tests. (On current Win10, disabled items are nearly black dark gray that I easily confuse with enabled black. On Mac, the contrast between its light-medium gray and black is unmistakable.)

I polished the fixer and merged it, with only manual testing, to immediately fix the regression. I re-labelled this issue to add an automated test that would have caught it.