Add .svn as workspace root marker (helix-editor#11429)

* add .svn as workspace-root marker

* cargo fmt

helix-loader/src/lib.rs

@@ -225,13 +225,16 @@ pub fn merge_toml_values(left: toml::Value, right: toml::Value, merge_depth: usi
 /// Used as a ceiling dir for LSP root resolution, the filepicker and potentially as a future filewatching root
 ///
 /// This function starts searching the FS upward from the CWD
-/// and returns the first directory that contains either `.git` or `.helix`.
+/// and returns the first directory that contains either `.git`, `.svn` or `.helix`.
 /// If no workspace was found returns (CWD, true).
 /// Otherwise (workspace, false) is returned
 pub fn find_workspace() -> (PathBuf, bool) {
     let current_dir = current_working_dir();
     for ancestor in current_dir.ancestors() {
-        if ancestor.join(".git").exists() || ancestor.join(".helix").exists() {
+        if ancestor.join(".git").exists()
+            || ancestor.join(".svn").exists()
+            || ancestor.join(".helix").exists()
+        {
             return (ancestor.to_owned(), false);
         }
     }