sway-borders
                                
                                
                                
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                        Allow forcing borders on undecorated windows
Is there a way we can apply these border texture to other surfaces, like status bar and notifications ?
As of this moment, no. Whatever would normally get borders is what gets border textures/shadows. However, I'm currently reworking everything to use shaders and one of the changes will be that every container can get it's own settings, the same way that right now, you can use commands or for_window to set things.