album: improved bottom insets handling

lib/thumbnail_collection.dart

@@ -30,13 +30,10 @@ class ThumbnailCollection extends StatelessWidget {
         ),
       );
     }
+    final bottomInsets = MediaQuery.of(context).viewInsets.bottom;
+    final sectionKeys = sections.keys.toList();
     return SafeArea(
       child: DraggableScrollbar.arrows(
-        labelTextBuilder: (double offset) => Text(
-          "${offset ~/ 1}",
-          style: TextStyle(color: Colors.blueGrey),
-        ),
-        controller: scrollController,
         child: CustomScrollView(
           controller: scrollController,
           slivers: [
@@ -44,13 +41,28 @@ class ThumbnailCollection extends StatelessWidget {
               title: Text('Aves - All'),
               floating: true,
             ),
-            ...sections.keys.map((sectionKey) => SectionSliver(
+            ...sectionKeys.map((sectionKey) {
+              Widget sliver = SectionSliver(
                 entries: entries,
                 sections: sections,
                 sectionKey: sectionKey,
-                )),
+              );
+              if (sectionKey == sectionKeys.last) {
+                sliver = SliverPadding(
+                  padding: EdgeInsets.only(bottom: bottomInsets),
+                  sliver: sliver,
+                );
+              }
+              return sliver;
+            }),
           ],
         ),
+        controller: scrollController,
+        padding: EdgeInsets.only(bottom: bottomInsets),
+        labelTextBuilder: (double offset) => Text(
+          "${offset ~/ 1}",
+          style: TextStyle(color: Colors.blueGrey),
+        ),
       ),
     );
   }