shell.openExternal API does not bring the opened application to the foreground

[ecarriou]

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for an issue that matches the one I want to file, without success.

Issue Details

• Electron Version:
  • 5.0.3
• Operating System:
  • macOS 10.14.5
• Last Known Working Electron version:
  • 4.0.8

Expected Behavior

Calling shell.openExternal API opens by default the url in the default browser and brings the opened application to the foreground.

Actual Behavior

Calling shell.openExternal API opens by default the url in the default browser and the opened application is behind the electron application.

[codebytere]

Fixed by #18721.