GNOME Bugzilla – Bug 755004
Panel background image is not resized immediately on panel orientation or size change
Last modified: 2015-11-02 00:38:13 UTC
Steps to reproduce: 1. Set an image as panel background. 2. Change the panel orientation and/or size. 3. See that the image background is not resized with the panel, you'll see black background on the empty space. Tested with current gnome-panel git master.
What size image did you use? By default it will set image as background with no modifications. You might want to change image style from none to stretch or fit, but that is not possible from properties dialog... none style image was not re-created when panel size was changed, this is now fixed. So if your image is large enough then there should not be empty black space.
I tested with a large image, and you fixed this problem. Thanks!