Fix title bar color inaccuracy on window restore

[vishal27shetty]

Fix title bar color inaccuracy on window restore

The issue

When VS Code is reopened after being closed with multiple windows open, all windows appear with the active title bar color, regardless of their actual focus state. This happens because the styling is applied before the window focus events have properly propagated through the system.

The fix

This PR addresses the issue by:

1. Assuming all windows are inactive during startup
2. Using event listeners (focus, blur, mousedown) to determine the actual focus state
3. Updating the title bar styling once the focus state is properly determined
4. Including a fallback timeout as a safety net

Testing

1. Open multiple VS Code windows
2. Close VS Code while multiple windows are open
3. Reopen VS Code through a desktop shortcut, Start Menu, or taskbar icon
4. Observe that only the focused window has the active title bar color, while other windows correctly show the inactive title bar color

Fixes #241405

[vishal27shetty]

@microsoft-github-policy-service agree