Gallery: Hide error when image is added/removed.

Gallery shows "No image" error when its model has an empty list of image, but
previously it does not hide the message when new image is added to the
model. The CL adds lines to hide the error message when item is added.

BUG=489639
TEST=None

Review URL: https://codereview.chromium.org/1152573002

Cr-Commit-Position: refs/heads/master@{#331293}

2 files changed, 2 insertions, 1 deletions

diff --git a/ui/file_manager/gallery/js/mosaic_mode.js b/ui/file_manager/gallery/js/mosaic_mode.js
index 1138a67..e17a116 100644
--- a/ui/file_manager/gallery/js/mosaic_mode.js
+++ b/ui/file_manager/gallery/js/mosaic_mode.js
@@ -503,6 +503,7 @@ Mosaic.prototype.onLeadChange_ = function(event) {
 Mosaic.prototype.onSplice_ = function(event) {
   var index = event.index;
   this.layoutModel_.invalidateFromTile_(index);
+  this.errorBanner_.clear();
 
   if (event.removed.length) {
     for (var t = 0; t !== event.removed.length; t++) {
diff --git a/ui/file_manager/gallery/js/slide_mode.js b/ui/file_manager/gallery/js/slide_mode.js
index d86f847..7471668 100644
--- a/ui/file_manager/gallery/js/slide_mode.js
+++ b/ui/file_manager/gallery/js/slide_mode.js
@@ -516,12 +516,12 @@ SlideMode.prototype.enter = function(
 
   // The latest |leave| call might have left the image animating. Remove it.
   this.unloadImage_();
+  this.errorBanner_.clear();
 
   new Promise(function(fulfill) {
     // If the items are empty, just show the error message.
     if (this.getItemCount_() === 0) {
       this.displayedItem_ = null;
-      //TODO(hirono) Show this message in the grid mode too.
       this.errorBanner_.show('GALLERY_NO_IMAGES');
       fulfill();
       return;