StackOverflowException when OSR browser gains Focus #489

Describe the bug
While running a JCEF-based application, I noticed some unexpected messages being written to the STDERR stream (System.err)

These messages simply read Exception in thread "AWT-EventQueue-0"

After a significant amount of effort, I tracked these down to an unreported StackOverflowError, being triggered by CefClient.onGotFocus

To Reproduce
Steps to reproduce the behavior:

1. Use the Simple example application
2. Update useOsr to true in the main method of the MainFrame class
3. Run the app as normal (ensuring the necessary --add-exports parameters are included for Java 9+)
4. Observe the System.err log output contains multiple instances of Exception in thread "AWT-EventQueue-0"

Expected behavior
We shouldn't see unexpected errors...

Versions (please complete the following information):

• OS: Windows
• Java Version: OpenJDK 17
• JCEF Version: 99c2f7a
• CEF Version: 127.3.1

Additional context
Putting a breakpoint in CefClient.onGotFocus reveals that this method is triggered repeatedly, with the following stack:

onGotFocus:461, CefClient (org.cef) [39]
N_SetFocus:-1, CefBrowser_N (org.cef.browser)
setFocus:497, CefBrowser_N (org.cef.browser)
onGotFocus:461, CefClient (org.cef) [38]
...