Resolution: Out of scope
5.9, 5.12, 5.14
macOS 10.15 (Catalina)
In macOS 10.15 (Catalina), the native Cocoa file save dialog will crash if all of the following are true:
- the user confirms the default filename without modifying it
- an extension is automatically added to the filename based on the selected filter
- a file with the same name already exists
- the user chooses to replace the file when prompted by macOS.
The following program demonstrates the problem:
The above program will prompt the user for a filename. If the file exists, and the user agrees to replace the file, the program will crash before the first call to QFileDialog::getSaveFileName() returns. Otherwise, the file will be created. Then the program will once again prompt the user for a filename. Assuming the file creation was successful, if the user chooses the same filename and agrees to replace the file, the program will crash.
seems to solve the problem. It can be as simple as this:
At first, my thought was to retain a reference to the NSURL passed to this method, and use that instead of calling [mSavePanel URL], since that seemed to be where the assertion failure was, but I found that simply providing an implementation of this method allowed the calls to [mSavePanel URL] to succeed.
To be fair, I see this more as a bug in Catalina than in Qt, but I think it would be good to implement this method of the NSOpenSavePanelDelegate protocol, especially since it seems to resolve this issue.