Make the toolbar menu items support the support space key.

[SimonZhao888]

Fixes #11449

Proposed changes

• Modify the ProcessCmdKey() method to support space key.
• Make a focus on the MenuStrip after the user hits enter to check it.

Customer Impact

• MenuItems does not respond to the spacebar key to check/uncheck the menu and enter key executes it and closes the menu without focus the menustrip.

Regression?

• No

Risk

-Minimal

Screenshots

Before

After

Test methodology

• Manual

Test environment(s)

• 9.0.100-preview.6.24312.9

Microsoft Reviewers: Open in CodeFlow

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 65.38462% with 9 lines in your changes missing coverage. Please review.

Project coverage is 74.56175%. Comparing base (fc56416) to head (d2966bf). Report is 83 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #11520 +/- ## =================================================== + Coverage 74.39859% 74.56175% +0.16316% =================================================== Files 3032 3041 +9 Lines 628149 629780 +1631 Branches 46828 46845 +17 =================================================== + Hits 467334 469575 +2241 + Misses 157465 156843 -622 - Partials 3350 3362 +12 ``` | [Flag](https://app.codecov.io/gh/dotnet/winforms/pull/11520/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet) | Coverage Δ | | |---|---|---| | [Debug](https://app.codecov.io/gh/dotnet/winforms/pull/11520/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet) | `74.56175% <65.38462%> (+0.16316%)` | :arrow_up: | | [integration](https://app.codecov.io/gh/dotnet/winforms/pull/11520/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet) | `17.87556% <3.84615%> (-0.12500%)` | :arrow_down: | | [production](https://app.codecov.io/gh/dotnet/winforms/pull/11520/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet) | `47.45164% <65.38462%> (+0.20467%)` | :arrow_up: | | [test](https://app.codecov.io/gh/dotnet/winforms/pull/11520/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet) | `96.97796% <ø> (+0.01124%)` | :arrow_up: | | [unit](https://app.codecov.io/gh/dotnet/winforms/pull/11520/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet) | `44.55491% <65.38462%> (+0.32596%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dotnet#carryforward-flags-in-the-pull-request-comment) to find out more.

[ricardobossan]

All LGTM