Remove small pieces of unused code

zed/src/editor/buffer/mod.rs

@@ -1650,10 +1650,6 @@ impl Fragment {
         self.text = self.insertion.text.slice(self.start_offset()..offset);
     }
 
-    fn as_str(&self) -> &str {
-        self.text.as_str()
-    }
-
     fn visible_len(&self) -> usize {
         if self.is_visible() {
             self.len()

zed/src/editor/buffer_element.rs

@@ -8,7 +8,7 @@ use gpui::{
     },
     text_layout::{self, TextLayoutCache},
     AfterLayoutContext, AppContext, Border, Element, Event, EventContext, FontCache, LayoutContext,
-    MutableAppContext, PaintContext, Quad, Scene, SizeConstraint, ViewHandle,
+    PaintContext, Quad, Scene, SizeConstraint, ViewHandle,
 };
 use smallvec::SmallVec;
 use std::cmp::Ordering;

zed/src/editor/buffer_view.rs

@@ -4,7 +4,6 @@ use super::{
 };
 use crate::{settings::Settings, watch, workspace};
 use anyhow::Result;
-use easy_parallel::Parallel;
 use gpui::{
     fonts::Properties as FontProperties, keymap::Binding, text_layout, App, AppContext, Element,
     ElementBox, Entity, FontCache, ModelHandle, View, ViewContext, WeakViewHandle,