SSH Remoting: Add the ability to resolve file paths on the remote host (#18250)

Release Notes:

- N/A

crates/remote_server/src/remote_editing_tests.rs

@@ -12,7 +12,7 @@ use lsp::{CompletionContext, CompletionResponse, CompletionTriggerKind};
 use node_runtime::NodeRuntime;
 use project::{
     search::{SearchQuery, SearchResult},
-    Project,
+    Project, ProjectPath,
 };
 use remote::SshSession;
 use serde_json::json;
@@ -440,6 +440,49 @@ async fn test_remote_lsp(cx: &mut TestAppContext, server_cx: &mut TestAppContext
     })
 }
 
+#[gpui::test]
+async fn test_remote_resolve_file_path(cx: &mut TestAppContext, server_cx: &mut TestAppContext) {
+    let (project, _headless, _fs) = init_test(cx, server_cx).await;
+    let (worktree, _) = project
+        .update(cx, |project, cx| {
+            project.find_or_create_worktree("/code/project1", true, cx)
+        })
+        .await
+        .unwrap();
+
+    let worktree_id = cx.update(|cx| worktree.read(cx).id());
+
+    let buffer = project
+        .update(cx, |project, cx| {
+            project.open_buffer((worktree_id, Path::new("src/lib.rs")), cx)
+        })
+        .await
+        .unwrap();
+
+    let path = project
+        .update(cx, |project, cx| {
+            project.resolve_existing_file_path("/code/project1/README.md", &buffer, cx)
+        })
+        .await
+        .unwrap();
+    assert_eq!(
+        path.abs_path().unwrap().to_string_lossy(),
+        "/code/project1/README.md"
+    );
+
+    let path = project
+        .update(cx, |project, cx| {
+            project.resolve_existing_file_path("../README.md", &buffer, cx)
+        })
+        .await
+        .unwrap();
+
+    assert_eq!(
+        path.project_path().unwrap().clone(),
+        ProjectPath::from((worktree_id, "README.md"))
+    );
+}
+
 fn init_logger() {
     if std::env::var("RUST_LOG").is_ok() {
         env_logger::try_init().ok();