Free up minimize slot when closing window

$Window.js

@@ -1683,6 +1683,8 @@ You can also disable this warning by passing {iframes: {ignoreCrossOrigin: true}
  $component.detach();
  }
  $w.closed = true;
+ minimize_slots[$w._minimize_slot_index] = null;
+
  $event_target.triggerHandler("closed");
  $w.trigger("closed");
  // TODO: change usages of "close" to "closed" where appropriate

CHANGELOG.md

@@ -15,6 +15,7 @@ The API is unstable, and [Semantic Versioning](https://semver.org/spec/v2.0.0.ht
 ### Fixed
 
 - Fixed positioning of windows when minimized without a taskbar.
+- Closing a window now frees up its minimize slot at the bottom of the screen (if there's no taskbar). Previously only unminimizing did this.
 
 </details>
 

cypress/e2e/windows.cy.js

@@ -35,11 +35,11 @@ describe('$Window Component', () => {
  title: 'Test Window 3',
  minimizeButton: true,
  });
- $window.close(); // free up slot
+ $window.close(); // free up slot (unminimizing should also do this)
  $window3.minimize();
  cy.get('.window').should('have.length', 2);
  cy.get('.window').last().should('have.css', 'bottom', '-3px');
- // cy.get('.window').last().should('have.css', 'left', '10px'); // FIXME: it's getting placed in the third slot, not the first
+ cy.get('.window').last().should('have.css', 'left', '10px');
  });
  });
  });