GH-88564: IDLE - fix 2 Edit menu hotkey displays

[terryjreedy]

On Mac Cocoa, ^+backspace and ^+space were mis-displayed as ^B and ^S. Replace 'backslash' with '' everywhere, just as 'slash', for example, is replaced with '/'. On Mac Cocoa, change 'space' to 'Space', which then displays as 'Space' instead of 'S'. ('Space' is also used for the Mac-specific Emoji & Symbols entry.)

Co-authored by ronaldoussoren

• Issue: IDLE: On macOS, cntl-space/backslash display as ^S/^B #88564

[terryjreedy]

@ronaldoussoren Besides Windows, I tested this on Catalina by editing installed editor.py. Is the space-> Space fix only needed for Cocoa?

[terryjreedy]

The test failure is hanging for 20 minutes in
test_case_soft_keyword (idlelib.idle_test.test_colorizer.ColorDelegatorTest.test_case_soft_keyword) .
I tested python3.x -m test.test_idle -v on my MacBook Air and got the same failure even with the 2 new lines commented out and with 3.11 and 3.10. I am baffled.
@ned-deily You have any ideas either?

[ronaldoussoren]

This PR does not work for me. If I manually apply the patch to an installed copy of Python 3.12 IDLE crashes when I try to open the Edit menu ("segmentation fault"). Reverting the patch fixes the crash.

The crash report has a stack trace somewhere deep inside system frameworks with Tk on the call stack.

The fix is likely only needed for Cocoa, otherwise we'd have reports from other platforms as well. But that's not something I can test, I can only test using the copy of Tk shipped with out installers.

[terryjreedy]

PR not working right yet.

[ronaldoussoren]

I've tested this PR with a slight modification to make it work on top of #113513:

diff --git a/Lib/idlelib/editor.py b/Lib/idlelib/editor.py
index 8bf517d41f..36fde4af73 100644
--- a/Lib/idlelib/editor.py
+++ b/Lib/idlelib/editor.py
@@ -1678,6 +1678,7 @@ def prepstr(s):
  'bracketleft': '[',
  'bracketright': ']',
  'slash': '/',
+ 'backslash': '\\',
 }
 
 def get_accelerator(keydefs, eventname):
diff --git a/Lib/idlelib/macosx.py b/Lib/idlelib/macosx.py
index 8637e8ebf2..60c58d59a3 100644
--- a/Lib/idlelib/macosx.py
+++ b/Lib/idlelib/macosx.py
@@ -263,6 +263,8 @@ def setupApp(root, flist):
     global _idle_root
     _idle_root = root
     if isAquaTk():
+        from idlelib import editor
+        editor.keynames["space"] = "Space"
         hideTkConsole(root)
         overrideRootMenu(root, flist)
         addOpenEventSupport(root, flist)

That PR makes it an error to call isAquaTk before macosx.setupApp is called to avoid problems with Tk Aqua (see that PR for background).

The menu now looks correct, and I've tested that the shortcuts work as well:

My change to the diff should work both with and without #113513. Please move setting idlelib.editor.keynames['space'] to macosx.setupApp as in the diff above to avoid creating merge conflict when that PR is merged.

[bedevere-app]

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