Send one-dimensional workspace coordinates, without output index

`ext_workspace_handle_v1::coordinates` defines the coordinate as
"an N-dimensional grid within a workspace group". So it is not
expected that the coordinates are unique between different groups, or
establish any geometry between different groups.

Whether we use one workspace per output or allow workspaces to span
outputs in the protocol, the whole workspace group is on the same set of
outputs. So I think this holds in any case.

I don't think we rely on this anywhere.

src/shell/mod.rs

@@ -331,7 +331,6 @@ pub struct WorkspaceSet {
     previously_active: Option<(usize, WorkspaceDelta)>,
     pub active: usize,
     pub group: WorkspaceGroupHandle,
-    idx: usize,
     tiling_enabled: bool,
     output: Output,
     theme: cosmic::Theme,
@@ -437,7 +436,6 @@ impl WorkspaceSet {
     fn new(
         state: &mut WorkspaceUpdateGuard<'_, State>,
         output: &Output,
-        idx: usize,
         tiling_enabled: bool,
         theme: cosmic::Theme,
     ) -> WorkspaceSet {
@@ -448,7 +446,6 @@ impl WorkspaceSet {
             previously_active: None,
             active: 0,
             group: group_handle,
-            idx,
             tiling_enabled,
             theme,
             sticky_layer,
@@ -569,7 +566,6 @@ impl WorkspaceSet {
         workspace_set_idx(
             state,
             self.workspaces.len() as u8 + 1,
-            self.idx,
             &workspace.handle,
             // this method is only used by code paths related to dynamic workspaces, so this should be fine
         );
@@ -620,17 +616,10 @@ impl WorkspaceSet {
 
         if kept.iter().any(|val| *val == false) {
             for (i, workspace) in self.workspaces.iter().enumerate() {
-                workspace_set_idx(state, i as u8 + 1, self.idx, &workspace.handle);
+                workspace_set_idx(state, i as u8 + 1, &workspace.handle);
             }
         }
     }
-
-    fn update_idx(&mut self, state: &mut WorkspaceUpdateGuard<'_, State>, idx: usize) {
-        self.idx = idx;
-        for (i, workspace) in self.workspaces.iter().enumerate() {
-            workspace_set_idx(state, i as u8 + 1, idx, &workspace.handle);
-        }
-    }
 }
 
 #[derive(Debug)]
@@ -674,13 +663,7 @@ impl Workspaces {
                 set
             })
             .unwrap_or_else(|| {
-                WorkspaceSet::new(
+                WorkspaceSet::new(workspace_state, &output, self.autotile, self.theme.clone())
-                    workspace_state,
-                    &output,
-                    self.sets.len(),
-                    self.autotile,
-                    self.theme.clone(),
-                )
             });
         workspace_state.add_group_output(&set.group, &output);
 
@@ -698,12 +681,7 @@ impl Workspaces {
                 other_set.add_empty_workspace(workspace_state);
             }
             for (i, workspace) in other_set.workspaces.iter_mut().enumerate() {
-                workspace_set_idx(
+                workspace_set_idx(workspace_state, i as u8 + 1, &workspace.handle);
-                    workspace_state,
-                    i as u8 + 1,
-                    other_set.idx,
-                    &workspace.handle,
-                );
             }
             other_set.active = other_set
                 .workspaces
@@ -728,7 +706,7 @@ impl Workspaces {
         for (i, workspace) in set.workspaces.iter_mut().enumerate() {
             workspace.set_output(output);
             workspace.refresh();
-            workspace_set_idx(workspace_state, i as u8 + 1, set.idx, &workspace.handle);
+            workspace_set_idx(workspace_state, i as u8 + 1, &workspace.handle);
             if i == set.active {
                 workspace_state.add_workspace_state(&workspace.handle, WState::Active);
             }
@@ -820,10 +798,6 @@ impl Workspaces {
                 } else {
                     workspace_state.remove_group_output(&workspace_group, output);
                 }
-
-                for (i, set) in self.sets.values_mut().enumerate() {
-                    set.update_idx(workspace_state, i);
-                }
             } else {
                 workspace_state.remove_group_output(&set.group, output);
                 self.backup_set = Some(set);
@@ -917,10 +891,6 @@ impl Workspaces {
                         // Otherwise we are fine
                     }
                 }
-                // fixup indices
-                for (i, set) in self.sets.values_mut().enumerate() {
-                    set.update_idx(workspace_state, i);
-                }
             }
             _ => {}
         };
@@ -998,12 +968,7 @@ impl Workspaces {
                 if keep.iter().any(|val| *val == false) {
                     for set in self.sets.values_mut() {
                         for (i, workspace) in set.workspaces.iter().enumerate() {
-                            workspace_set_idx(
+                            workspace_set_idx(workspace_state, i as u8 + 1, &workspace.handle);
-                                workspace_state,
-                                i as u8 + 1,
-                                set.idx,
-                                &workspace.handle,
-                            );
                         }
                     }
                 }
@@ -4019,11 +3984,10 @@ impl Shell {
 fn workspace_set_idx(
     state: &mut WorkspaceUpdateGuard<'_, State>,
     idx: u8,
-    output_pos: usize,
     handle: &WorkspaceHandle,
 ) {
     state.set_workspace_name(handle, format!("{}", idx));
-    state.set_workspace_coordinates(handle, &[idx as u32, output_pos as u32]);
+    state.set_workspace_coordinates(handle, &[idx as u32]);
 }
 
 pub fn check_grab_preconditions(