Fix the issue of no scan after dir creation and/or deletion

When `EditorFileDialog` creates/deletes a directory during interactive
operation, it needs to notify `EditorFileSystem` to scan and detect
the filesystem change.

Author: Rindbee

editor/gui/editor_file_dialog.cpp

@@ -30,6 +30,7 @@
 
 #include "editor_file_dialog.h"
 
+#include "core/config/project_settings.h"
 #include "editor/docks/filesystem_dock.h"
 #include "editor/file_system/dependency_editor.h"
 #include "editor/settings/editor_settings.h"
@@ -92,6 +93,26 @@ void EditorFileDialog::_validate_property(PropertyInfo &p_property) const {
 	}
 }
 
+void EditorFileDialog::_dir_contents_changed() {
+	bool scan_required = false;
+	switch (get_access()) {
+		case FileDialog::ACCESS_RESOURCES: {
+			scan_required = true;
+		} break;
+		case FileDialog::ACCESS_USERDATA: {
+			// Directories within the project dir are unlikely to be accessed.
+		} break;
+		case FileDialog::ACCESS_FILESYSTEM: {
+			// Directories within the project dir may still be accessed.
+			const String localized_path = ProjectSettings::get_singleton()->localize_path(get_current_dir());
+			scan_required = localized_path.is_resource_file();
+		} break;
+	}
+	if (scan_required) {
+		EditorFileSystem::get_singleton()->scan_changes();
+	}
+}
+
 void EditorFileDialog::_notification(int p_what) {
 	switch (p_what) {
 		case NOTIFICATION_VISIBILITY_CHANGED: {

editor/gui/editor_file_dialog.h

@@ -41,6 +41,7 @@ class EditorFileDialog : public FileDialog {
 
 protected:
 	virtual void _item_menu_id_pressed(int p_option) override;
+	virtual void _dir_contents_changed() override;
 
 	virtual bool _should_use_native_popup() const override;
 	virtual bool _should_hide_file(const String &p_file) const override;

scene/gui/file_dialog.cpp

@@ -1064,8 +1064,11 @@ void FileDialog::_file_list_select_first() {
 }
 
 void FileDialog::_delete_confirm() {
-	OS::get_singleton()->move_to_trash(_get_item_path(_get_selected_file_idx()));
-	invalidate();
+	Error err = OS::get_singleton()->move_to_trash(_get_item_path(_get_selected_file_idx()));
+	if (err == OK) {
+		invalidate();
+		_dir_contents_changed();
+	}
 }
 
 void FileDialog::_filename_filter_selected() {
@@ -1537,6 +1540,7 @@ FileDialog::Access FileDialog::get_access() const {
 void FileDialog::_make_dir_confirm() {
 	Error err = dir_access->make_dir(new_dir_name->get_text().strip_edges());
 	if (err == OK) {
+		_dir_contents_changed();
 		_change_dir(new_dir_name->get_text().strip_edges());
 		update_filters();
 		_push_history();

scene/gui/file_dialog.h

@@ -368,6 +368,7 @@ class FileDialog : public ConfirmationDialog {
 
 	bool _can_use_native_popup() const;
 	virtual void _item_menu_id_pressed(int p_option);
+	virtual void _dir_contents_changed() {}
 
 	virtual bool _should_use_native_popup() const;
 	virtual bool _should_hide_file(const String &p_file) const { return false; }