Graphing mode: Attempting to invoke keypad buttons with Narrator does not work

[joshkoon]

Describe the bug
With Narrator turned on, attempting to invoke buttons on the graphing mode keypad via Spacebar instead types a space into an equation.

Steps To Reproduce

1. Go to Graphing Mode.
2. Turn on Narrator.
3. Use Tab to navigate to the equations
4. Use Capslock + right/left arrow keys to navigate to the keypad.
   Note: Navigating to keypad via Tab is blocked by Issue In Graphing mode, the keypad cannot be reached via the Tab key #948
5. With a button highlighted, attempt to invoke the button via spacebar.
6. Observe the value is not entered; instead, a space is added to an equation.

Expected behavior
Users should be able to enter values from the keypad by invoking buttons via the keyboard.

Screenshots

Device and Application Information

• OS Build: 10.0.19547.0
• Architecture: x64
• Application Version: 10.1912.4.0
• Region: en-US
• Dev Version Installed:

Additional context

Requested Assignment

I'm just reporting this problem. I don't want to fix it.

[MicrosoftIssueBot]

This is your friendly Microsoft Issue Bot. I've seen this issue come in and have gone to tell a human about it.

[ghost]

This issue has been automatically marked as stale because it has not had any activity for 7 days. It will be closed if no further activity occurs within 7 days of this comment. Thank you for your contributions to Windows Calculator!

[grochocki]

Thanks for the detailed bug report! This is by design in Graphing Mode.

Unlike other calculator modes where the onscreen keyboard is locked to one display input/output area, Graphing Mode supports free-form input. While we still have the on-screen keyboard, it now behaves more like a SIP and is not intended to receive keyboard or screen reader focus. All operations available in the SIP can be entered with standard keyboard input. The SIP is still available for simpler pointer input.

Free-from input in other modes is tracked by #620.