Don't autosave unmodified buffers (#32626)

Closes https://github.com/zed-industries/zed/issues/12091

Proper redo of https://github.com/zed-industries/zed/pull/32603

Release Notes:

- Fixed formatting effects not triggered when saving unmodified
singleton buffers

---------

Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Co-authored-by: Cole Miller <m@cole-miller.net>

crates/diagnostics/src/diagnostics.rs

@@ -43,7 +43,7 @@ use ui::{Icon, IconName, Label, h_flex, prelude::*};
 use util::ResultExt;
 use workspace::{
     ItemNavHistory, ToolbarItemLocation, Workspace,
-    item::{BreadcrumbText, Item, ItemEvent, ItemHandle, TabContentParams},
+    item::{BreadcrumbText, Item, ItemEvent, ItemHandle, SaveOptions, TabContentParams},
     searchable::SearchableItemHandle,
 };
 
@@ -849,12 +849,12 @@ impl Item for ProjectDiagnosticsEditor {
 
     fn save(
         &mut self,
-        format: bool,
+        options: SaveOptions,
         project: Entity<Project>,
         window: &mut Window,
         cx: &mut Context<Self>,
     ) -> Task<Result<()>> {
-        self.editor.save(format, project, window, cx)
+        self.editor.save(options, project, window, cx)
     }
 
     fn save_as(