When you tile a window, say to the right with Tiling Assitant, it retains the round edges and still looks as a non-tiled application.
Here's some pictures for reference
Tiled window using GNOME native tiling

A closer look at the bottom right edge

Tiled window using Tiling Assistant

A closer look at the bottom right edge

Possible solution
Now I think this can be solved by adding the relevant tiling styles to a tiled window. For example, the above extension gets the tiled-top, tiled-left and "tiled-bottom` classes.

Here are the relevant styles in libadwaita,
It would be nice if Tiling Assistant could add these styles too.
When you tile a window, say to the right with Tiling Assitant, it retains the round edges and still looks as a non-tiled application.
Here's some pictures for reference
Tiled window using GNOME native tiling
A closer look at the bottom right edge
Tiled window using Tiling Assistant
A closer look at the bottom right edge
Possible solution
Now I think this can be solved by adding the relevant tiling styles to a tiled window. For example, the above extension gets the
tiled-top,tiled-leftand "tiled-bottom` classes.Here are the relevant styles in libadwaita,
It would be nice if Tiling Assistant could add these styles too.