Open Radar

 
Summary:
If an app that is opened in Slide Over mode uses openURL to open the current full-screen app, the app is called again with the same url when it is invoked at a later time.

Steps to Reproduce
- open app A regularly on an iPad
- swipe from the right side of the screen to open app B in a Slide Over mode over app A
- let app B call app A using [UIApplication openURL:]
- now app A is opened and the app delegate is supplied with the URL and the Slide Over is gone
- tap the home button to switch to the home screen
- open app A again from the home screen

Expected Results:
- the app delegate of app A should not be called again with the same URL

Actual Results:
- app A is opened and the app delegate is supplied AGAIN with the same URL as in the previous openURL call

Regression:
It only seems to occur when the Slide Over app uses openURL to call the current full-screen app. It does not seem to happen if another app is currently in full-screen mode below the Slide Over. It also happens when using the multitasking switcher or multitasking gestures to switch away from and back to app A.

Notes:
Here is a concrete example with the existing apps "Working Copy" and "Textastic" where this behavior causes data loss for the user:

- open Textastic in fullscreen mode on an iPad
- use the file action "Edit in Textastic" from Working Copy in Slide Over mode
- Textastic is called with a "replace" x-callback-url call. It sends the contents of the file from Working Copy to Textastic and saves it in a local file and then opens the file.
- make changes to the file in Textastic
- tap the home button to switch to the home screen
- open Textastic from the home screen
- now iOS calls Textastic *again* with the same "replace" x-callback-url call and the user's changes are lost