Fix items list problems when adding item with a search entered

When an item is created, an active quick search is cleared, but that's
now an async operation. We weren't waiting for that, which meant that
new items weren't selected and depending on a race condition could even
show the welcome pane despite there being items in the library.

chrome/content/zotero/xpcom/itemTreeView.js

@@ -811,8 +811,14 @@ Zotero.ItemTreeView.prototype.notify = Zotero.Promise.coroutine(function* (actio
 			}
 
 			if (!allDeleted) {
-				// DEBUG: Search is async, so this might not work properly
 				quicksearch.doCommand();
+				// See _refreshPromise note below
+				if (this._refreshPromise) {
+					try {
+						yield this._refreshPromise;
+					}
+					catch (e) {}
+				}
 				madeChanges = true;
 				sort = true;
 			}
@@ -873,6 +879,15 @@ Zotero.ItemTreeView.prototype.notify = Zotero.Promise.coroutine(function* (actio
 				}
 			}
 			quicksearch.doCommand();
+			// We have to wait for the search in order to select new items properly, but doCommand()
+			// doesn't provide the return value from the oncommand handler, so we can't wait for an
+			// asynchronous handler. But really they just end up calling refresh(), so we wait for that.
+			if (this._refreshPromise) {
+				try {
+					yield this._refreshPromise;
+				}
+				catch (e) {}
+			}
 			madeChanges = true;
 			sort = true;
 		}

test/tests/itemTreeViewTest.js

@@ -137,6 +137,28 @@ describe("Zotero.ItemTreeView", function() {
 			assert.equal(selected[0], existingItemID);
 		});
 
+		it("should clear search and select new item if non-matching quick search is active", async function () {
+			await createDataObject('item');
+
+			var quicksearch = win.document.getElementById('zotero-tb-search');
+			quicksearch.value = Zotero.randomString();
+			quicksearch.doCommand();
+			await itemsView._refreshPromise;
+
+			assert.equal(itemsView.rowCount, 0);
+
+			// Create item
+			var item = await createDataObject('item');
+
+			assert.isAbove(itemsView.rowCount, 0);
+			assert.equal(quicksearch.value, '');
+
+			// New item should be selected
+			var selected = itemsView.getSelectedItems();
+			assert.lengthOf(selected, 1);
+			assert.equal(selected[0].id, item.id);
+		});
+
 		it("shouldn't clear quicksearch if skipSelect is passed", function* () {
 			var searchString = Zotero.Items.get(existingItemID).getField('title');