Enforce all columns resize to content and fixed

This will also resize child row's columns on group item's expanding automatically, but the size will be fixed and user can not resize them.

avalon/tools/cbloader/app.py

@@ -183,11 +183,6 @@ def _assetschanged(self):
         document = asset_item.data(DocumentRole)
         subsets_model.set_asset(document['_id'])
 
-        # Enforce the columns to fit the data (purely cosmetic)
-        columns = subsets_model.columnCount(QtCore.QModelIndex())
-        for i in range(columns):
-            subsets.view.resizeColumnToContents(i)
-
         # Clear the version information on asset change
         self.data['model']['version'].set_version(None)
 

avalon/tools/cbloader/widgets.py

@@ -85,6 +85,10 @@ def __init__(self, parent=None):
         self.view.setModel(self.family_proxy)
         self.view.customContextMenuRequested.connect(self.on_context_menu)
 
+        header = self.view.header()
+        # Enforce the columns to fit the data (purely cosmetic)
+        header.setSectionResizeMode(QtWidgets.QHeaderView.ResizeToContents)
+
         selection = view.selectionModel()
         selection.selectionChanged.connect(self.active_changed)