[ios] Fixes Bookmarks crash when deleting a cell being edited.

When a new Folder is created, the folder cell is created on edit mode. If we try to delete the cell
at this point (by swiping the cell to the left) a crash occurs (both on legacy and UIRefresh).

This Cl prevent this crash by returning NO on canEditRowAtIndexPath for the editingFolderCell.

Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Iaca9d4d7001d89d795d2ce2c82db46a092086ec9
Reviewed-on: https://chromium-review.googlesource.com/1098230
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566705}

ios/chrome/browser/ui/bookmarks/bookmark_home_view_controller.mm

@@ -1744,6 +1744,13 @@ const CGFloat kShadowRadius = 12.0f;
     return NO;
   }
 
+  // If the cell at |indexPath| is being edited (which happens when creating a
+  // new Folder) return NO.
+  if (self.sharedState.editingFolderCell ==
+      [self.tableView cellForRowAtIndexPath:indexPath]) {
+    return NO;
+  }
+
   // Enable the swipe-to-delete gesture and reordering control for nodes of
   // type URL or Folder, but not the permanent ones.
   BookmarkHomeNodeItem* nodeItem =

ios/chrome/browser/ui/bookmarks/bookmarks_egtest.mm

@@ -2977,6 +2977,27 @@ id<GREYMatcher> TappableBookmarkNodeWithLabel(NSString* label) {
   [BookmarksTestCase verifyBookmarkFolderIsSeen:@"Folder 2"];
 }
 
+- (void)testCantDeleteCellBeingEdited {
+  [BookmarksTestCase setupStandardBookmarks];
+  [BookmarksTestCase openBookmarks];
+  [BookmarksTestCase openMobileBookmarks];
+
+  // Create a new folder and type "New Folder 1" without pressing return.
+  NSString* newFolderTitle = @"New Folder";
+  [BookmarksTestCase createNewBookmarkFolderWithFolderTitle:newFolderTitle
+                                                pressReturn:NO];
+
+  // Swipe action to try to delete the newly created folder while its name its
+  // being edited.
+  [[EarlGrey
+      selectElementWithMatcher:TappableBookmarkNodeWithLabel(@"New Folder")]
+      performAction:grey_swipeFastInDirection(kGREYDirectionLeft)];
+
+  // Verify the delete confirmation button doesn't show up.
+  [[EarlGrey selectElementWithMatcher:BookmarksDeleteSwipeButton()]
+      assertWithMatcher:grey_nil()];
+}
+
 // Tests that all elements on the bookmarks landing page are accessible.
 - (void)testAccessibilityOnBookmarksLandingPage {
   [BookmarksTestCase setupStandardBookmarks];