### Godot version

4.1.dev (dc625bcbfc5b587ba8867481ee7a1f6a567c25d0)

### System information

Mageia 9, Linux

### Issue description

When importing a project in current `master`, the following error is raised for each asset that gets imported:
```
Attempting to parent and popup a dialog that already has a parent.
```

It seems to be raised once per asset, caused by the progress dialog.

CC @bruvzg

### Steps to reproduce

- Import a new project in Godot that contains importable assets, e.g. https://github.com/RPicster/godot4-demo-desert-light

### Minimal reproduction project

See above.
}
	for (int i = 0; i < vsplits.size(); i++) {
		bool in_use = dock_slot[i * 2 + 0]->get_tab_count() || dock_slot[i * 2 + 1]->get_tab_count();
		if (in_use) {
			vsplits[i]->show();
		} else {
			vsplits[i]->hide();
		}
	}
	if (right_l_vsplit->is_visible() || right_r_vsplit->is_visible()) {
		right_hsplit->show();
	} else {
		right_hsplit->hide();
	}
	for (int i = 0; i < DOCK_SLOT_MAX; i++) {
		if (dock_slot[i]->is_visible() && dock_slot[i]->get_tab_count()) {
			dock_slot[i]->set_current_tab(0);
		}
	}
	
	if (p_layout->has_section_key(p_section, "dock_filesystem_split")) {
		int fs_split_ofs = p_layout->get_value(p_section, "dock_filesystem_split");
		FileSystemDock::get_singleton()->set_split_offset(fs_split_ofs);
	}
	if (p_layout->has_section_key(p_section, "dock_filesystem_display_mode")) {
		FileSystemDock::DisplayMode dock_filesystem_display_mode = FileSystemDock::DisplayMode(int(p_layout->get_value(p_section, "dock_filesystem_display_mode")));
		FileSystemDock::get_singleton()->set_display_mode(dock_filesystem_display_mode);
	}
	if (p_layout->has_section_key(p_section, "dock_filesystem_file_sort")) {
		FileSystemDock::FileSortOption dock_filesystem_file_sort = FileSystemDock::FileSortOption(int(p_layout->get_value(p_section, "dock_filesystem_file_sort")));