just putting windows side by side is not enough. i need to be able to treat those two side by side windows as a unit: see how i use it as an example here:
https://news.ycombinator.com/item?id=47913202no windowmanager anywhere supports that. even tabs could have been solved by window managers. but then we could not get inactive tabs, and the same is true for the tabs in splitview.
if lack of support for inactive tabs are no issue and if you don't use workspaces much, you could use those as a workaround. but that unfortunately at least gnome workspaces are not flexible enough for that. (i'd need dynamic creation of workspaces without automatic destruction, and i'd need gnome to remember which window goes into which workstation. that used to be a feature on some windowmanagers, but i haven't found any that can distinguish multiple windows from the same app.)
