Implemented {project} placeholder for external dotnet editor

[crazyStewie]

This PR fixes #81845 , by mimicking the implementation at

godot/editor/plugins/script_editor_plugin.cpp

Lines 2291 to 2316 in 4df80b0

	String project_path = ProjectSettings::get_singleton()->get_resource_path();
	flags = flags.replacen("{line}", itos(p_line > 0 ? p_line : 0));
	flags = flags.replacen("{col}", itos(p_col));
	flags = flags.strip_edges().replace("\\\\", "\\");
	int from = 0;
	int num_chars = 0;
	bool inside_quotes = false;
	for (int i = 0; i < flags.size(); i++) {
	if (flags[i] == '"' && (!i || flags[i - 1] != '\\')) {
	if (!inside_quotes) {
	from++;
	}
	inside_quotes = !inside_quotes;
	} else if (flags[i] == '\0' || (!inside_quotes && flags[i] == ' ')) {
	String arg = flags.substr(from, num_chars);
	if (arg.contains("{file}")) {
	has_file_flag = true;
	}
	// do path replacement here, else there will be issues with spaces and quotes
	arg = arg.replacen("{project}", project_path);
	arg = arg.replacen("{file}", script_path);

As the function ProjectSettings::get_singleton()->get_resource_path() isn't exposed in the godot API, this solution instead makes use of ProjectSettings.GlobalizePath("res://"), which, on editor builds, returns ProjectSettings.resource_path + "/", according to its implementation at

godot/core/config/project_settings.cpp

Lines 257 to 272 in 4df80b0

	String ProjectSettings::globalize_path(const String &p_path) const {
	if (p_path.begins_with("res://")) {
	if (!resource_path.is_empty()) {
	return p_path.replace("res:/", resource_path);
	}
	return p_path.replace("res://", "");
	} else if (p_path.begins_with("user://")) {
	String data_dir = OS::get_singleton()->get_user_data_dir();
	if (!data_dir.is_empty()) {
	return p_path.replace("user:/", data_dir);
	}
	return p_path.replace("user://", "");
	}
	return p_path;
	}

[raulsntos]

Thanks for contributing to the .NET module! The changes look good, they're pretty much the same changes requested by @RedworkDE in #74517 (comment).

[raulsntos]

Looks good to me already. Since you are a new contributor, make sure to read CONTRIBUTING.md and the contributing documentation if you haven't already.

You'll need to squash the commits before this PR can be merged. The contributing documentation contains information about squashing in case you need it.

Feel free to reach out in the development chat if you need help.

[akien-mga]

Thanks! And congrats for your first merged Godot contribution 🎉

[YuriSizov]

Cherry-picked for 4.1.4.