add multi_selectable option to datatable (bokeh#14524)

Author: muendlein

bokehjs/src/lib/models/widgets/tables/data_table.ts

@@ -380,6 +380,7 @@ export class DataTableView extends WidgetView {
       frozenRow: frozen_row,
       frozenBottom: frozen_bottom,
       explicitInitialization: false,
+      multiSelect: this.model.multi_selectable,
     }
 
     this.data = new TableDataProvider(this.model.source, this.model.view)
@@ -504,6 +505,7 @@ export namespace DataTable {
     scroll_to_selection: p.Property<boolean>
     header_row: p.Property<boolean>
     row_height: p.Property<number>
+    multi_selectable: p.Property<boolean>
   }
 }
 
@@ -542,6 +544,7 @@ export class DataTable extends TableWidget {
       scroll_to_selection: [ Bool, true ],
       header_row:          [ Bool, true ],
       row_height:          [ Int, 25 ],
+      multi_selectable:    [ Bool, true ],
     }))
 
     this.override<DataTable.Props>({

src/bokeh/models/widgets/tables.py

@@ -886,6 +886,10 @@ def __init__(self, *args: Any, **kwargs: Any) -> None:
     The height of each row in pixels.
     """)
 
+    multi_selectable = Bool(True, help="""
+    Whether multiple rows can be selected.
+    """)
+
     @staticmethod
     def from_data(data, columns=None, formatters={}, **kwargs) -> DataTable:
         """ Create a simple table from a pandas dataframe, dictionary or ColumnDataSource.

tests/baselines/defaults.json5

@@ -7526,6 +7526,7 @@
     scroll_to_selection: true,
     header_row: true,
     row_height: 25,
+    multi_selectable: true,
   },
   DateEditor: {
     __extends__: "CellEditor",