Start on adding support for editing via the assistant panel (#14795)

Note that this shouldn't have any visible user-facing behavior yet. The
feature is incomplete but we wanna merge early to avoid a long-running
branch.

Release Notes:

- N/A

---------

Co-authored-by: Nathan <nathan@zed.dev>

crates/zed/src/zed.rs

@@ -670,7 +670,7 @@ fn open_log_file(workspace: &mut Workspace, cx: &mut ViewContext<Workspace>) {
                             })
                         });
 
-                        workspace.add_item_to_active_pane(Box::new(editor), None, cx);
+                        workspace.add_item_to_active_pane(Box::new(editor), None, true, cx);
                     })
                     .log_err();
             })
@@ -889,7 +889,9 @@ fn open_telemetry_log_file(workspace: &mut Workspace, cx: &mut ViewContext<Works
                 });
                 workspace.add_item_to_active_pane(
                     Box::new(cx.new_view(|cx| Editor::for_multibuffer(buffer, Some(project), true, cx))),
-                    None,cx,
+                    None,
+                    true,
+                    cx,
                 );
             }).log_err()?;
 
@@ -924,6 +926,7 @@ fn open_bundled_file(
                             Editor::for_multibuffer(buffer, Some(project.clone()), true, cx)
                         })),
                         None,
+                        true,
                         cx,
                     );
                 })