On Tue, 23 May 2023 15:24:55 GMT, Lukasz Kostyra <lkost...@openjdk.org> wrote:
>> Crashes started happening due to macOS DnD API change from macOS 10.14 >> onwards. 10.14 incrodues some [DnD >> constrains](https://developer.apple.com/documentation/macos-release-notes/appkit-release-notes-for-macos-10_14#Drag-and-Drop) >> which our DnD code happened to trigger on some occasions. >> >> Our code used deprecated `dragImage` API which since 10.14 had new >> requirement - each NSPasteboard item had to have a corresponding drag image. >> Not meeting this constraint raised an exception, which crashed the app. >> Since there was no possibility to add more drag images to `dragImage` API >> (it only took one NSImage as parameter) the code had to be rewritten - as >> such I upgraded it to new DnD API utilizing NSDraggingSession and related >> protocols. >> >> One side-effect of new DnD API is that it now modifies NSPasteboard for us - >> previous behavior was more "separated" from user code perspective (write >> items to pasteboard -> initiate a drag via `dragImage`). Manually updating >> NSPasteboard before calling `beginDraggingSessionWithItems` raised another >> exception related to NSPasteboard already having DnD-ed elements inside it. >> Some system tests, however, relied on that behavior and writing to >> NSPasteboard (`MacPasteboardShim.java` used in some tests creates a >> `Clipboard.DND` for test purposes). Since this path is in tests I assumed >> this behavior should stay and tried to make it as close to working as >> possible. Tests (including those using `MacPasteboardShim`) pass after my >> changes. >> >> Additionally, added a new manual test based on `DndTest.java` test which >> creates two temporary files and allows for testing faulty behavior. > > Lukasz Kostyra has updated the pull request incrementally with one additional > commit since the last revision: > > Release resources to prevent leaks I updated the code as suggested. Interesting behavior I did not expect, but the more you know - thanks for catching that. ------------- PR Comment: https://git.openjdk.org/jfx/pull/1089#issuecomment-1561224875
