feat(dialog): allow setting canCreateDirectories on macOS (#978)

* feat(dialog): allow setting `canCreateDirectories` on macOS

closes #949

* Discard changes to plugins/log/src/api-iife.js

* Discard changes to plugins/store/src/api-iife.js

* Discard changes to plugins/window-state/src/api-iife.js

* Update plugins/dialog/src/commands.rs

Co-authored-by: Fabian-Lars <fabianlars@fabianlars.de>

* Update plugins/dialog/src/commands.rs

Co-authored-by: Fabian-Lars <fabianlars@fabianlars.de>

* Update plugins/dialog/src/lib.rs

Co-authored-by: Fabian-Lars <fabianlars@fabianlars.de>

* Update plugins/dialog/guest-js/index.ts

Co-authored-by: Fabian-Lars <fabianlars@fabianlars.de>

* Update plugins/dialog/guest-js/index.ts

Co-authored-by: Fabian-Lars <fabianlars@fabianlars.de>

---------

Co-authored-by: Fabian-Lars <fabianlars@fabianlars.de>

plugins/dialog/src/lib.rs

@@ -267,6 +267,7 @@ pub struct FileDialogBuilder<R: Runtime> {
     pub(crate) starting_directory: Option<PathBuf>,
     pub(crate) file_name: Option<String>,
     pub(crate) title: Option<String>,
+    pub(crate) can_create_directories: Option<bool>,
     #[cfg(desktop)]
     pub(crate) parent: Option<raw_window_handle::RawWindowHandle>,
 }
@@ -291,6 +292,7 @@ impl<R: Runtime> FileDialogBuilder<R> {
             starting_directory: None,
             file_name: None,
             title: None,
+            can_create_directories: None,
             #[cfg(desktop)]
             parent: None,
         }
@@ -345,6 +347,12 @@ impl<R: Runtime> FileDialogBuilder<R> {
         self
     }
 
+    /// Set whether it should be possible to create new directories in the dialog. Enabled by default. **macOS only**.
+    pub fn set_can_create_directories(mut self, can: bool) -> Self {
+        self.can_create_directories.replace(can);
+        self
+    }
+
     /// Shows the dialog to select a single file.
     /// This is not a blocking operation,
     /// and should be used when running on the main thread to avoid deadlocks with the event loop.