Restore "snap to minimize/maximize" feature with grid editor layout (fixes #51614)

src/vs/base/browser/ui/grid/grid.ts

@@ -279,10 +279,15 @@ export class Grid<T extends IView> implements IDisposable {
 	getViewSize(view: T): number {
 		const location = this.getViewLocation(view);
 		const viewSize = this.gridview.getViewSize(location);
-
 		return getLocationOrientation(this.orientation, location) === Orientation.HORIZONTAL ? viewSize.width : viewSize.height;
 	}
 
+	// TODO@joao cleanup
+	getViewSize2(view: T): { width: number; height: number; } {
+		const location = this.getViewLocation(view);
+		return this.gridview.getViewSize(location);
+	}
+
 	maximizeViewSize(view: T): void {
 		const location = this.getViewLocation(view);
 		this.gridview.maximizeViewSize(location);

src/vs/workbench/browser/parts/editor/editorPart.ts

@@ -544,6 +544,14 @@ export class EditorPart extends Part implements EditorGroupsServiceImpl, IEditor
 		// Mark group as new active
 		group.setActive(true);
 
+		// Maximize the group if it is currently minimized
+		if (this.gridWidget) {
+			const viewSize = this.gridWidget.getViewSize2(group);
+			if (viewSize.width === group.minimumWidth || viewSize.height === group.minimumHeight) {
+				this.arrangeGroups(GroupsArrangement.MINIMIZE_OTHERS);
+			}
+		}
+
 		// Event
 		this._onDidActiveGroupChange.fire(group);
 	}