Autosave files on close, when setting is afterDelay (#36929)

Closes https://github.com/zed-industries/zed/issues/12149
Closes #35524

Release Notes:

- Improved autosave behavior, to prevent a confirmation dialog when
quickly closing files and using the `afterDelay` setting

---------

Co-authored-by: MrSubidubi <finn@zed.dev>

crates/workspace/src/workspace_settings.rs

@@ -254,6 +254,17 @@ pub enum AutosaveSetting {
     OnWindowChange,
 }
 
+impl AutosaveSetting {
+    pub fn should_save_on_close(&self) -> bool {
+        matches!(
+            &self,
+            AutosaveSetting::OnFocusChange
+                | AutosaveSetting::OnWindowChange
+                | AutosaveSetting::AfterDelay { .. }
+        )
+    }
+}
+
 #[derive(Copy, Clone, Debug, Serialize, Deserialize, PartialEq, Eq, JsonSchema)]
 #[serde(rename_all = "snake_case")]
 pub enum PaneSplitDirectionHorizontal {