Fix bugs from recent PRs (#11147)

Fix missed delete in project panel
Fix blinking scrollbar from selections-in-scrollbar change

Release Notes:

- N/A (nightly only)

crates/project_panel/src/project_panel.rs

@@ -471,7 +471,8 @@ impl ProjectPanel {
                             .separator()
                             .action("Rename", Box::new(Rename))
                             .when(!is_root, |menu| {
-                                menu.action("Delete", Box::new(Delete { skip_prompt: false }))
+                                menu.action("Trash", Box::new(Trash { skip_prompt: false }))
+                                    .action("Delete", Box::new(Delete { skip_prompt: false }))
                             })
                             .when(is_local & is_root, |menu| {
                                 menu.separator()