Don't set data_source if the tree is not visible, in this case it's never used
This issue was migrated from bug 2045 in our old bug tracker.
Original bug information:
Reporter: Anders Broman
Status: RESOLVED FIXED
Product: Wireshark
Component: GTK+ UI
OS: Windows XP
Platform: x86
Version: 0.99.8
Attachments:
05_data_source.patch: 05_data_source.patch