mac: osr: cefclient: Some key presses do not work as expected in text fields

[TroikaTronix]

Describe the bug
When running cefclient on macOS Mojave 12.7 on an M1 MacBook Pro, and while using Offscreen Rendering to OpenGL (command line options: --off-screen-rendering-enabled, --shared-texture-enabled) pressing the following keys have undesired results:

d = Attempts to Enable Dictation
e = Shows the Emoji Selector View
f = Puts the current Window in fullscreen

To Reproduce
Steps to reproduce the behavior:

1. Compile CEF on macOS
2. Ensure the command line arguments are include --off-screen-rendering-enabled and --shared-texture-enabled
3. Navigate to Google.com
4. Click in the text input box to enter your search text
5. Enter the letters 'a', 's', 'k' -- all of these work as expected.
6. Now type the letter 'd' -- macOS will ask you if you wish to enable dictation (if it isn't already enabled)
7. Now type the letter 'e' -- macOS will show the Emoji and Symbols Character Viewer
8. Now type the letter 'f' -- the main CEF window will go fullscreen

Expected behavior
When you type the letters 'd', 'e', and 'f' without any modifiers, the text should be inserted into the currently selected text input field.

Screenshots

Versions
cef_binary_131.3.1+gcb062df+chromium-131.0.6778.109_macosarm64
macOS Mojave 12.7
MacBook Pro M1

Additional context
A clue to the solution: in the file text_input_client_osr_mac.mm
in the function HandleKeyEventBeforeTextInputClient:(NSEvent*)keyEvent
if you change the first instance of this code

browser_->GetHost()->SendKeyEvent(keyEvent);

to

if (keyEvent.unmodified_character == 'd' || keyEvent.unmodified_character == 'e' || keyEvent.unmodified_character == 'f')
    keyEvent.unmodified_character = 0;
browser_->GetHost()->SendKeyEvent(keyEvent);

the problem no longer happens.

Does the problem reproduce with Google Chrome at the same version?
No.