Override app list folder view preferred bounds.

App list folders should expand from the folder's origin.The bounds for
the folder should be 8 dip from the edge of the screen and should not be
limited by the app list container bounds.


Bug: 1018305
Change-Id: I3597dbe96c697f5c268ddd9cc5157c62f7600f5e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2197422
Commit-Queue: Yulun Wu <yulunwu@chromium.org>
Reviewed-by: Yulun Wu <yulunwu@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#768542}

ash/app_list/views/app_list_folder_view.cc

@@ -48,6 +48,7 @@ namespace {
 
 constexpr int kFolderHeaderPadding = 12;
 constexpr int kOnscreenKeyboardTopPadding = 16;
+constexpr int kFolderHorizontalMargin = 8;
 
 // Indexes of interesting views in ViewModel of AppListFolderView.
 constexpr int kIndexBackground = 0;
@@ -605,11 +606,18 @@ void AppListFolderView::UpdatePreferredBounds() {
   const gfx::Size search_box_size =
       contents_view_->GetSearchBoxSize(AppListState::kStateApps);
   // Adjust for apps container margins.
-  container_bounds.Inset(container_view_->CalculateMarginsForAvailableBounds(
-      container_bounds, search_box_size));
+  gfx::Insets adjusted_margins =
+      container_view_->CalculateMarginsForAvailableBounds(container_bounds,
+                                                          search_box_size);
+  // App list folders can open past the app list bounds and within
+  // |kFolderHorizontalMargin| px of the screen.
+  adjusted_margins.set_left(kFolderHorizontalMargin);
+  adjusted_margins.set_right(kFolderHorizontalMargin);
+  container_bounds.Inset(adjusted_margins);
+
   // Avoid overlap with the search box widget.
   container_bounds.Inset(
-      8, search_box_size.height() + SearchBoxView::GetFocusRingSpacing(), 8, 0);
+      0, search_box_size.height() + SearchBoxView::GetFocusRingSpacing(), 0, 0);
   preferred_bounds_.AdjustToFit(container_bounds);
 
   // Calculate the folder icon's bounds relative to this view.