v46-83 - Tab layout enhancements

What's Changed

• Correct vertical position of tabbed windows by @AndrewKvalheim in #393
• Automatically exit the tabbed layout when only a single tab remains by @AndrewKvalheim in #392
• Middle click to close tab by @AndrewKvalheim in #395

New Contributors

• @AndrewKvalheim made their first contribution in #393

Full Changelog: v46-80...v46-83