Try to implement openFileExplorerAndSelectFile for OSX

Author: nyalldawson

src/native/mac/qgsmacnative.h

@@ -27,6 +27,7 @@ class NATIVE_EXPORT QgsMacNative : public QgsNative
 
     virtual const char *currentAppLocalizedName();
     void currentAppActivateIgnoringOtherApps() override;
+    void openFileExplorerAndSelectFile( const QString &path ) override;
 };
 
 #endif // QGSMACNATIVE_H

src/native/mac/qgsmacnative.mm

@@ -34,3 +34,10 @@
   [[NSRunningApplication currentApplication] activateWithOptions:
     (NSApplicationActivateAllWindows | NSApplicationActivateIgnoringOtherApps)];
 }
+
+void openFileExplorerAndSelectFile( const QString &path )
+{
+  NSString* pathStr = [[NSString alloc] initWithUTF8String:path.toUtf8().data()];
+  NSArray *fileURLs = [NSArray arrayWithObjects:pathStr, /* ... */ nil];
+  [[NSWorkspace sharedWorkspace] activateFileViewerSelectingURLs:fileURLs];
+}