project_panel: Fix create entry with trailing dot duplicating on windows (#44524)

Release Notes:

- Fixed an issue where creating a file through the project panel with a
trailing dot in its name would duplicate the entries with and without
the dot

Co-authored by: Smit Barmase <smit@zed.dev>

crates/languages/src/go.rs

@@ -73,7 +73,9 @@ impl LspInstaller for GoLspAdapter {
                     delegate.show_notification(NOTIFICATION_MESSAGE, cx);
                 })?
             }
-            anyhow::bail!("cannot install gopls");
+            anyhow::bail!(
+                "Could not install the Go language server `gopls`, because `go` was not found."
+            );
         }
 
         let release =

crates/project_panel/src/project_panel.rs

@@ -1663,12 +1663,20 @@ impl ProjectPanel {
         let edit_state = self.state.edit_state.as_mut()?;
         let worktree_id = edit_state.worktree_id;
         let is_new_entry = edit_state.is_new_entry();
-        let filename = self.filename_editor.read(cx).text(cx);
+        let mut filename = self.filename_editor.read(cx).text(cx);
+        let path_style = self.project.read(cx).path_style(cx);
+        if path_style.is_windows() {
+            // on windows, trailing dots are ignored in paths
+            // this can cause project panel to create a new entry with a trailing dot
+            // while the actual one without the dot gets populated by the file watcher
+            while let Some(trimmed) = filename.strip_suffix('.') {
+                filename = trimmed.to_string();
+            }
+        }
         if filename.trim().is_empty() {
             return None;
         }
 
-        let path_style = self.project.read(cx).path_style(cx);
         let filename_indicates_dir = if path_style.is_windows() {
             filename.ends_with('/') || filename.ends_with('\\')
         } else {

crates/project_panel/src/project_panel_tests.rs

@@ -6612,6 +6612,74 @@ async fn test_create_entries_without_selection_hide_root(cx: &mut gpui::TestAppC
     );
 }
 
+#[cfg(windows)]
+#[gpui::test]
+async fn test_create_entry_with_trailing_dot_windows(cx: &mut gpui::TestAppContext) {
+    init_test(cx);
+
+    let fs = FakeFs::new(cx.executor());
+    fs.insert_tree(
+        path!("/root"),
+        json!({
+            "dir1": {
+                "file1.txt": "",
+            },
+        }),
+    )
+    .await;
+
+    let project = Project::test(fs.clone(), [path!("/root").as_ref()], cx).await;
+    let workspace = cx.add_window(|window, cx| Workspace::test_new(project.clone(), window, cx));
+    let cx = &mut VisualTestContext::from_window(*workspace, cx);
+
+    let panel = workspace
+        .update(cx, |workspace, window, cx| {
+            let panel = ProjectPanel::new(workspace, window, cx);
+            workspace.add_panel(panel.clone(), window, cx);
+            panel
+        })
+        .unwrap();
+    cx.run_until_parked();
+
+    #[rustfmt::skip]
+    assert_eq!(
+        visible_entries_as_strings(&panel, 0..20, cx),
+        &[
+            "v root",
+            "    > dir1",
+        ],
+        "Initial state with nothing selected"
+    );
+
+    panel.update_in(cx, |panel, window, cx| {
+        panel.new_file(&NewFile, window, cx);
+    });
+    cx.run_until_parked();
+    panel.update_in(cx, |panel, window, cx| {
+        assert!(panel.filename_editor.read(cx).is_focused(window));
+    });
+    panel
+        .update_in(cx, |panel, window, cx| {
+            panel
+                .filename_editor
+                .update(cx, |editor, cx| editor.set_text("foo.", window, cx));
+            panel.confirm_edit(true, window, cx).unwrap()
+        })
+        .await
+        .unwrap();
+    cx.run_until_parked();
+    #[rustfmt::skip]
+    assert_eq!(
+        visible_entries_as_strings(&panel, 0..20, cx),
+        &[
+            "v root",
+            "    > dir1",
+            "      foo  <== selected  <== marked",
+        ],
+        "A new file is created under the root directory without the trailing dot"
+    );
+}
+
 #[gpui::test]
 async fn test_highlight_entry_for_external_drag(cx: &mut gpui::TestAppContext) {
     init_test(cx);