createpool: Use StoragePool.default_target_path

Indirectly, rather than the less useful get_default_dir

virtManager/createpool.py

@@ -5,6 +5,7 @@
 # See the COPYING file in the top-level directory.
 
 import logging
+import os
 
 from gi.repository import Gdk
 from gi.repository import Gtk
@@ -481,7 +482,11 @@ class vmmCreatePool(vmmGObjectUI):
             self.widget("pool-source-path").get_child().set_text(source)
 
     def _browse_target_cb(self, src):
-        startfolder = StoragePool.get_default_dir(self.conn.get_backend())
+        current = self.widget("pool-target-path").get_child().get_text()
+        startfolder = None
+        if current:
+            startfolder = os.path.dirname(current)
+
         target = self.err.browse_local(self.conn,
                 _("Choose target directory"),
                 dialog_type=Gtk.FileChooserAction.SELECT_FOLDER,

virtinst/storage.py

@@ -313,7 +313,8 @@ class StoragePool(_StorageObject):
         if (self.type == self.TYPE_DIR or
             self.type == self.TYPE_NETFS or
             self.type == self.TYPE_FS):
-            return os.path.join(self.get_default_dir(self.conn), self.name)
+            return os.path.join(
+                    _preferred_default_pool_path(self.conn), self.name)
         if self.type == self.TYPE_LOGICAL:
             name = self.name
             if self.source_name: