Only downloads URLs that end in gif, jpg, jpeg, or png.
Fixes a bug where code that could trigger a UI layout (adding an image leading to a resizing of the image view) on a background thread.
When searched tags are removed, select the top most item now in the list, even if the current image is still in the list, just further down.
Makes sure the omnibar is in focus at launch, to emphasize adding and searching features and reduce the risk of someone 'searching' in the tag entry field.
Todo updates