kms: Use scaled sizes for placing new outputs

src/backend/kms/device.rs

@@ -277,7 +277,7 @@ impl State {
                 ) {
                     Ok((output, should_expose)) => {
                         if should_expose {
-                            w += output.config().transformed_size().w as u32;
+                            w += output.geometry().size.w as u32;
                             wl_outputs.push(output.clone());
                         }
                         device.outputs.insert(conn, output);
@@ -345,13 +345,7 @@ impl State {
                         .find_map(|(crtc, surface)| (surface.connector == conn).then_some(crtc))
                         .cloned()
                     {
-                        let surface = device.surfaces.remove(&crtc).unwrap();
+                        device.surfaces.remove(&crtc).unwrap();
-                        if surface.output.mirroring().is_none() {
-                            // TODO: move up later outputs?
-                            w = w.saturating_sub(
-                                surface.output.config().transformed_size().w as u32,
-                            );
-                        }
                     }
 
                     if !changes.added.iter().any(|(c, _)| c == &conn) {
@@ -376,7 +370,7 @@ impl State {
                     ) {
                         Ok((output, should_expose)) => {
                             if should_expose {
-                                w += output.config().transformed_size().w as u32;
+                                w += output.geometry().size.w as u32;
                                 outputs_added.push(output.clone());
                             }
 

src/backend/kms/mod.rs

@@ -635,7 +635,7 @@ impl KmsState {
                         startup_done.clone(),
                     )?;
                     if output.mirroring().is_none() {
-                        w += output.config().transformed_size().w as u32;
+                        w += output.geometry().size.w as u32;
                     }
                 }
             }

src/config/mod.rs

@@ -3,6 +3,7 @@
 use crate::{
     shell::Shell,
     state::{BackendData, State},
+    utils::prelude::OutputExt,
     wayland::protocols::{
         output_configuration::OutputConfigurationState, workspace::WorkspaceUpdateGuard,
     },
@@ -476,6 +477,16 @@ impl Config {
             output_state.update();
             self.write_outputs(output_state.outputs());
         } else {
+            // we don't have a config, so lets generate somewhat sane positions
+            let mut w = 0;
+            for output in outputs.iter().filter(|o| o.mirroring().is_none()) {
+                {
+                    let mut config = output.config_mut();
+                    config.position = (w, 0);
+                }
+                w += output.geometry().size.w as u32;
+            }
+
             if let Err(err) = backend.apply_config_for_outputs(
                 false,
                 loop_handle,