[DataGrid] Update cell editable state if editable prop is updated in the column definition

packages/x-data-grid/src/components/cell/GridCell.tsx

@@ -195,7 +195,14 @@ const GridCell = forwardRef<HTMLDivElement, GridCellProps>(function GridCell(pro
     formattedValue: forcedFormattedValue,
   });
   cellParams.api = apiRef.current;
-  cellParams.isEditable = useGridSelector(apiRef, () => apiRef.current.isCellEditable(cellParams));
+
+  // Subscribe to changes of the `isCellEditable` API result to ensure cells re-render.
+  // We don't use the result.
+  // Subscription will trigger a new call of `getCellParamsForRow` above which will recompute the correct value of `isEditable`.
+  // This is to ensure both of the following cases work:
+  // - https://github.com/mui/mui-x/issues/19732
+  // - https://github.com/mui/mui-x/issues/20143
+  useGridSelector(apiRef, () => apiRef.current.isCellEditable(cellParams));
 
   const isSelected = useGridSelector(apiRef, () =>
     apiRef.current.unstable_applyPipeProcessors('isCellSelected', false, {

packages/x-data-grid/src/tests/editing.DataGrid.test.tsx

@@ -0,0 +1,100 @@
+import * as React from 'react';
+import { createRenderer, screen } from '@mui/internal-test-utils';
+import { DataGrid, gridClasses, GridColDef, GridRowsProp } from '@mui/x-data-grid';
+import { getCell } from 'test/utils/helperFn';
+
+describe('<DataGrid /> - Cell editable state', () => {
+  const { render } = createRenderer();
+
+  function expectCellEditable(rowIndex: number, colIndex: number) {
+    expect(getCell(rowIndex, colIndex)).to.have.class(gridClasses['cell--editable']);
+  }
+
+  function expectCellNotEditable(rowIndex: number, colIndex: number) {
+    expect(getCell(rowIndex, colIndex)).not.to.have.class(gridClasses['cell--editable']);
+  }
+
+  // based on https://github.com/mui/mui-x/issues/19732
+  it('should update cell editable state when `isCellEditable` prop changes', async () => {
+    const rows: GridRowsProp = [
+      { id: 1, name: 'A', age: 20 },
+      { id: 2, name: 'B', age: 21 },
+    ];
+
+    const columns: GridColDef[] = [
+      { field: 'name', editable: true, width: 150 },
+      { field: 'age', type: 'number', editable: true, width: 150 },
+    ];
+
+    function GridWithState() {
+      const [editable, setEditable] = React.useState(true);
+      const [editMode, setEditMode] = React.useState<'row' | 'cell'>('cell');
+
+      return (
+        <div style={{ width: 400, height: 400 }}>
+          <button onClick={() => setEditable((s) => !s)}>toggle-editable</button>
+          <button onClick={() => setEditMode((s) => (s === 'row' ? 'cell' : 'row'))}>
+            toggle-mode
+          </button>
+          <DataGrid
+            rows={rows}
+            columns={columns}
+            editMode={editMode}
+            isCellEditable={(params) => params.row.age % 2 === 0 && editable && editMode === 'cell'}
+          />
+        </div>
+      );
+    }
+
+    const { user } = render(<GridWithState />);
+
+    // Initially: editMode = 'cell', editable = true → row 0 cells editable
+    expectCellEditable(0, 0);
+    expectCellEditable(0, 1);
+    expectCellNotEditable(1, 0);
+
+    // Toggle editable → should remove editable class immediately
+    await user.click(screen.getByRole('button', { name: 'toggle-editable' }));
+    expectCellNotEditable(0, 0);
+    expectCellNotEditable(0, 1);
+
+    // Toggle mode to 'cell' again (it was set to false only) by switching mode away and back
+    await user.click(screen.getByRole('button', { name: 'toggle-mode' }));
+    // Now editMode = 'row' → should not be editable regardless of row parity
+    expectCellNotEditable(0, 0);
+
+    await user.click(screen.getByRole('button', { name: 'toggle-mode' }));
+    // Back to 'cell' but editable state is false → still not editable
+    expectCellNotEditable(0, 0);
+  });
+
+  // based on https://github.com/mui/mui-x/issues/20143
+  it('should update cell editable state when `colDef.editable` changes', async () => {
+    const rows: GridRowsProp = [{ id: 1, firstName: 'Jon', lastName: 'Snow', age: 14 }];
+
+    function Component() {
+      const [isEditable, setIsEditable] = React.useState(true);
+      const cols: GridColDef[] = [
+        { field: 'id', width: 100 },
+        { field: 'firstName', width: 150, editable: isEditable },
+        { field: 'lastName', width: 150, editable: true },
+      ];
+
+      return (
+        <div style={{ width: 500, height: 400 }}>
+          <button onClick={() => setIsEditable((p) => !p)}>toggle-coldef</button>
+          <DataGrid rows={rows} columns={cols} isCellEditable={() => true} />
+        </div>
+      );
+    }
+
+    const { user } = render(<Component />);
+
+    // firstName column is editable initially
+    expectCellEditable(0, 1);
+
+    // Toggle colDef.editable to false → class should be removed immediately
+    await user.click(screen.getByRole('button', { name: 'toggle-coldef' }));
+    expectCellNotEditable(0, 1);
+  });
+});