Long sn fix (#499)

* Improve tasks.py

- Works from any subdir now

* Update stock detail display

* FIx width of "serial" column in stock item list

lib/widget/stock/stock_detail.dart

@@ -467,7 +467,7 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
         title: Text("${widget.item.partName}"),
         subtitle: Text("${widget.item.partDescription}"),
         leading: InvenTreeAPI().getThumbnail(widget.item.partImage),
-        trailing: Text(
+        trailing: widget.item.isSerialized() ? null : Text(
           widget.item.quantityString(),
           style: TextStyle(
             fontSize: 20,
@@ -548,7 +548,7 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
           ListTile(
             title: Text(L10().serialNumber),
             leading: FaIcon(FontAwesomeIcons.hashtag),
-            trailing: Text("${widget.item.serialNumber}"),
+            subtitle: Text("${widget.item.serialNumber}"),
           )
       );
     } else {

lib/widget/stock/stock_list.dart

@@ -133,14 +133,17 @@ class _PaginatedStockItemListState extends PaginatedSearchState<PaginatedStockIt
 
     return ListTile(
       title: Text("${item.partName}"),
-      subtitle: Text("${item.locationPathString}"),
+      subtitle: Text(item.locationPathString),
       leading: InvenTreeAPI().getThumbnail(item.partThumbnail),
-      trailing: Text("${item.displayQuantity}",
-        style: TextStyle(
-          fontWeight: FontWeight.bold,
-          fontSize: 16,
-          color: InvenTreeAPI().StockStatus.color(item.status),
-        ),
+      trailing: SizedBox(
+        width: 48,
+        child: Text("${item.displayQuantity}",
+          style: TextStyle(
+            fontWeight: FontWeight.bold,
+            fontSize: 14,
+            color: InvenTreeAPI().StockStatus.color(item.status),
+          ),
+        )
       ),
       onTap: () {
         Navigator.push(context, MaterialPageRoute(builder: (context) => StockDetailWidget(item)));