Save Dialog Not Working - Even Not In save_file_dialog.py Example - on macOS

[SurfChriz]

Specification

• pywebview version: 3.3.1 (but have seen the issue in older versions as well)
• platform / version: macOS 10.15.6, Python 3.7.3

Description

When executing window.create_file_dialog(webview.SAVE_DIALOG....), the program stops execution and never delivers a result for that call.

I stumbled over the issue in a personal project and narrowed it down to not being able to execute the save_file_dialog.py example with the expected result.
Since it worked previously I suspected the macOS updates being the reason. So I started analysing by using the mac console.app, which brought up two errors when I executed the line of code in question:

1. [NSOpenPanel filenames]: unrecognized (NSOpenPanel) selector sent to instance 0x7f865687c3a0. This sandboxed application's NSSavePanel class object only responds to NSSavePanel APIs! Please use the interface as described in NSSavePanel.h.
2. (
   0 CoreFoundation 0x00007fff36a16b57 __exceptionPreprocess + 250
   1 libobjc.A.dylib 0x00007fff6f85d5bf objc_exception_throw + 48
   2 CoreFoundation 0x00007fff36a3f34c -[NSException raise] + 9
   3 _objc.cpython-37m-darwin.so 0x000000010b8a59de PyObjCErr_ToObjCWithGILState + 46
   4 _objc.cpython-37m-darwin.so 0x000000010b883333 method_stub + 5395
   5 _objc.cpython-37m-darwin.so 0x000000010b8a5364 ffi_closure_unix64_inner + 708
   6 _objc.cpython-37m-darwin.so 0x000000010b8a4886 ffi_closure_unix64 + 70
   7 CoreFoundation 0x00007fff3699ad52 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
   8 CoreFoundation 0x00007fff3699acf1 __CFRunLoopDoSource0 + 103
   9 CoreFoundation 0x00007fff3699ab0b __CFRunLoopDoSources0 + 209
   10 CoreFoundation 0x00007fff3699983a __CFRunLoopRun + 927
   11 CoreFoundation 0x00007fff36998e3e CFRunLoopRunSpecific + 462
   12 HIToolbox 0x00007fff355c5abd RunCurrentEventLoopInMode + 292
   13 HIToolbox 0x00007fff355c57d5 ReceiveNextEventCommon + 584
   14 HIToolbox 0x00007fff355c5579 _BlockUntilNextEventMatchingListInModeWithFilter + 64
   15 AppKit 0x00007fff33c0b039 _DPSNextEvent + 883
   16 AppKit 0x00007fff33c09880 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1352
   17 AppKit 0x00007fff33bfb58e -[NSApplication run] + 658
   18 _objc.cpython-37m-darwin.so 0x000000010b8a4707 ffi_call_unix64 + 79
   19 ??? 0x000000010e2c8ac8 0x0 + 4532767432
   )

This looks like some security sandbox issues to me, but I am not pretty familiar with native mac development...

Practicalities

• I am not willing to work on this issue myself.
• I am not prepared to support this issue financially.

[r0x0r]

I cannot reproduce it with save_file_dialog example. 10.5.4 / pywebview master.

[SurfChriz]

You mean macOS 10.5.4? That would underline the idea of having a macOS issue with recent updates.
I remember, that it worked roughly a year ago, so probably on 10.14.x. Probably due to the enhanced System Integrity Protection... But I am only guessing...

[r0x0r]

Fixed in master now.

[r0x0r]

Released in 3.3.3