More keyboard use within split view, select tab from keyboard

[FulanoD3Tal]

One of the best features of the browser is the split view, horizontal, vertical or grid, but one downside is no posibility to select the tabs you want to split with the keyboard, press CTRL+ALT+U select other tab and split view again, witout have to touch the mouse.

one proporsal is to add some keyboard shortcut for toggle selection of a tab from the toolbar