bug(mac): Key processing with text selection problems

[bharanidharanj]

Describe the bug

The Text Selection and Key Processing spc test cases with legacy apps show some limitations.

Please have a look here for the test cases and the Google doc for the test results.

Keyman 17.0.218
macOS 14.1.1
Google Chrome 119.0.6045.199

Reproduce the bug

Failed tests:

1. (T02) ^⁞X the quick brown fox⁞ in doc. Typing BKSP, then Shift+A.
   Expected result: Â⁞
   Actual result:^A⁞
2. (T04) ^⁞X⁞ in doc. Typing Shift+A.
   Expected result: Â⁞
   Actual result:^A
3. (T05) ^⁞X the quick brown fox⁞ in doc. Typing Shift+A.
   Expected result: Â⁞
   Actual result:^A
4. (T07) ^⁞X⁞ in doc. Typing BKSP, BKSP.
   Expected result: foo⁞
   Actual result: Blank
5. (T09) a⁞bc de⁞ in doc with selection starting at b. Typing BKSP.
   Expected result: a⁞
   Actual result: ab
6. (T15) Type X, A followed by [K_BKQUOTE] and B. Select B (Xa⁞b⁞).
   Press BKSP twice.
   Expected result: X⁞
   Actual result: Xa
7. (T16) Type X, A followed by [K_BKQUOTE] and B. Select B (Xa⁞b⁞).
   Press BKSP then O.
   Expected result: Xao⁞
   Actual result: Xa`o
8. T17) Type 1 followed by TAB key, then type 1.
   Expected result: ፩
   Actual result: After pressing the TAB key move the cursor to the bottom of the page.

Expected behavior

No response

Related issues

#10012

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Keyman version

17.0.218-alpha

Operating system

macOS 14.1.1 Sonoma

Device

No response

Target application

No response

Browser

Chrome

Keyboard name

No response

Keyboard version

No response

Language name

No response

Additional context

No response