Set tiled window corner radius separately from various UI elements

[boomshroom]

I like to use use primarily stacked mode, but part of that is wanting no space between windows and the edge of the screen, which is why Gaps around tiled windows is set to 0. As it stands, there are very small, but annoying, gaps in the corners of libcosmic windows as well as the top corners of the stack header bar. While these could be desirable when using intentional gaps around windows, they're not so desirable in my use-case. As it stands, this could be resolved by setting radius_s to 0 for all 4 corners, but this has the undesired side-effect of making various unrelated elements within libcosmic apps square, whereas I'd prefer to keep said elements primarily rounded. A possible work-around is to open up a libcosmic app and make it full-screen within a stack causing the stack header bar to become square, though this has its own issues.

Also, even when rounded window edges are desired in tiling mode, I have trouble seeing a reason to make the top corners of a window rounded when in stacked mode. I would expect the corners to only apply to the bottom corners of the window and the top corners of the stack header bar.

[git-f0x]

The corners of libcosmic app windows should technically be square when tiling (similar to GTK apps), but there are bugs with the detection of window states currently (e.g. in the code, sharp_corners should be set to true when a window is tiled, but that doesn't happen).
GTK apps also get square corners when stacked, but ideally, only the top corners would be made square, but it probably needs support on the app side (GTK/libcosmic).

[boomshroom]

I considered making it about sharp_corners, but then considered that some people who use tiling windows like gaps between them, and having rounded corners when tiled with gaps still makes sense. Enabling sharp_corners specifically when gaps are set to 0 could still work though.

I have been able to force sharp_corners by opening a libcosmic app within a window stack and then making it full screen, which then makes the stack header bar flush with the screen corners, but it's very awkward to actually use.

[Drakulix]

I considered making it about sharp_corners, but then considered that some people who use tiling windows like gaps between them, and having rounded corners when tiled with gaps still makes sense.

No, that would be against the xdg-shell spec.

What should happen here, if people want round corners in tiled mode is the compositor clipping the window. Tiled windows themselves should never apply something like this.