feat(tree): multi-selection no longer requires holding shift key

src/components/calcite-tree-item/calcite-tree-item.tsx

@@ -246,7 +246,7 @@ export class CalciteTreeItem implements ConditionalSlotComponent {
     }
     this.calciteTreeItemSelect.emit({
       modifyCurrentSelection:
-        (e as any).shiftKey || this.selectionMode === TreeSelectionMode.Ancestors,
+        this.selectionMode === TreeSelectionMode.Ancestors || this.isSelectionMulti(),
       forceToggle: false
     });
   }
@@ -256,7 +256,7 @@ export class CalciteTreeItem implements ConditionalSlotComponent {
     this.expanded = !this.expanded;
     if (this.selectionMode !== TreeSelectionMode.Ancestors) {
       this.calciteTreeItemSelect.emit({
-        modifyCurrentSelection: event.shiftKey,
+        modifyCurrentSelection: this.isSelectionMulti(),
         forceToggle: true
       });
     }
@@ -270,7 +270,7 @@ export class CalciteTreeItem implements ConditionalSlotComponent {
     switch (e.key) {
       case " ":
         this.calciteTreeItemSelect.emit({
-          modifyCurrentSelection: e.shiftKey,
+          modifyCurrentSelection: this.isSelectionMulti(),
           forceToggle: false
         });
 
@@ -288,7 +288,7 @@ export class CalciteTreeItem implements ConditionalSlotComponent {
           this.selected = true;
         } else {
           this.calciteTreeItemSelect.emit({
-            modifyCurrentSelection: e.shiftKey,
+            modifyCurrentSelection: this.isSelectionMulti(),
             forceToggle: false
           });
         }
@@ -429,4 +429,11 @@ export class CalciteTreeItem implements ConditionalSlotComponent {
       return;
     }
   };
+
+  private isSelectionMulti(): boolean {
+    return (
+      this.selectionMode === TreeSelectionMode.Multi ||
+      this.selectionMode === TreeSelectionMode.MultiChildren
+    );
+  }
 }

src/components/calcite-tree/calcite-tree.e2e.ts

@@ -254,7 +254,6 @@ describe("calcite-tree", () => {
         await item1.click();
 
         expect(await getSelectedIds()).toEqual(["1"]);
-        await page.keyboard.down("Shift");
 
         await item2.click();