Phone and tablet
On the phone and tablet, the only appearance configuration should be setting the background picture for the welcome screen. Therefore the screen should be called simply “Background”. On the home screen, the “Background” icon should include a thumbnail of the currently selected background.
Without external display
To minimize interaction needed, in the normal case where there is no external display, the “Background”screen should act as its own preview. Therefore, it should customize the header bar to 50% opacity, so that you can see the current background in exactly the current crop.
The row of “New” plus “Recent” items should be scrollable horizontally if necessary. The scroll position should reset whenever you return to the screen (so that you don’t lose sight of the “New” button) or choose a different background (so that you can see the previous selection become the new most recent).
The “Recent” list should consist of the ten most recently chosen distinct background settings, that is, image plus crop. This means there may be multiple recent background settings that use the same picture but with different crops. A crop should be saved whenever you leave the “Background” screen.
If you choose a new image, that image should zoom up from the “New” button to be shown as the current background. And if if you tap any of the “Recent” items, that image should similarly zoom up to become the current background. At the same time, any “Recent” items to its left should slide along one spot, making way for the previous selection to zoom down to become the most “Recent” item. If you chose a new image, the least recent setting should disappear from the list.
Long-pressing a “Recent” item should reveal a context menu with a single item, “Delete”. (Deleting recent background settings will be a rarely-needed feature, usually wanted only after breakups.)
The standard gestures should zoom and pan the picture to choose the area (bug 1368286). In case you do not realize this, iIf you have been on the “Background” screen for five seconds after making a selection, without doing anything else, the “Pinch to crop” hint should fade in and out over two seconds, followed by the “Drag to move” hint. The hints should not appear if the current image is exactly the size of the phone screen (suggesting that it was supplied specifically to be used, uncropped, on that handset).
With external display
When an external display is connected, the top-level “Background” screen should instead show two previews: “Phone” and “External”.
Tapping either of them should navigate down the page stack to a “Phone” or “External Display” screen, that behaves the same way as the “Background” screen does for a standalone phone.
Background settings for the phone display and the external display should be completely independent.
The “Appearance” panel’s “Behavior” [sic] tab should include “Show the menus for a window:” radio buttons, “In the menu bar” and “In the window’s title bar”.
The Launcher settings should be moved from their three previous locations (“Look”, “Behavior”, and “Displays”) into a single “Launcher & Menus” panel, including the previous menu settings. This will make the Launcher settings easier to find, and also make the contents of the “Background & Theme” panel closer to the “Background” panel on phone and tablet.