Combining split view tabs visually in the sidebar for ease of access and general QOL

[churuzzz]

Had this idea that it might be cool. It's a bit annoying when you have split tabs with tabs that all have the same name.

What I was thinking is doing like a visual marker to the edge of the tab that replicates the "Container" marks but stretches across the split tabs like so:

This would make it more clear to find the split tabs by groups and forcing them to be next to one another may make using the Cntr + PgUp/PgDn shortcut more convenient within the split tabs than Cntr + Tab.

Alternatively, rather than doing this directly on the tabs, to maintain tab groups in the future, the split tabs can be duplicated at the bottom in visual groups that only show up during a split and are marked as grouped there.

This could be a feature that can be enabled or disabled at the will of the user since it wouldn't affect the function of the actual tabs in the side bar.