Make the show/hide layer buttons work (#118) (#127)

core/document/src/document.rs

@@ -300,6 +300,14 @@ impl Document {
 				let children = self.layer_panel(path.as_slice())?;
 				Some(vec![DocumentResponse::DocumentChanged, DocumentResponse::ExpandFolder { path, children }])
 			}
+			Operation::ToggleVisibility { path } => {
+				let _ = self.layer_mut(&path).map(|layer| {
+					layer.visible = !layer.visible;
+					layer.cache_dirty = true;
+				});
+				let children = self.layer_panel(&path.as_slice()[..path.len() - 1])?;
+				Some(vec![DocumentResponse::ExpandFolder { path: vec![], children }])
+			}
 		};
 		Ok(responses)
 	}

core/document/src/operation.rs

@@ -68,4 +68,7 @@ pub enum Operation {
 	DiscardWorkingFolder,
 	ClearWorkingFolder,
 	CommitTransaction,
+	ToggleVisibility {
+		path: Vec<LayerId>,
+	},
 }