Fix a bunch of other low-hanging style lints (#36498)

- **Fix a bunch of low hanging style lints like unnecessary-return**
- **Fix single worktree violation**
- **And the rest**

Release Notes:

- N/A

crates/text/src/text.rs

@@ -1149,7 +1149,7 @@ impl Buffer {
             // Insert the new text before any existing fragments within the range.
             if !new_text.is_empty() {
                 let mut old_start = old_fragments.start().1;
-                if old_fragments.item().map_or(false, |f| f.visible) {
+                if old_fragments.item().is_some_and(|f| f.visible) {
                     old_start += fragment_start.0 - old_fragments.start().0.full_offset().0;
                 }
                 let new_start = new_fragments.summary().text.visible;
@@ -1834,7 +1834,7 @@ impl Buffer {
         let mut edits: Vec<(Range<usize>, Arc<str>)> = Vec::new();
         let mut last_end = None;
         for _ in 0..edit_count {
-            if last_end.map_or(false, |last_end| last_end >= self.len()) {
+            if last_end.is_some_and(|last_end| last_end >= self.len()) {
                 break;
             }
             let new_start = last_end.map_or(0, |last_end| last_end + 1);
@@ -2671,7 +2671,7 @@ impl<D: TextDimension + Ord, F: FnMut(&FragmentSummary) -> bool> Iterator for Ed
 
             if pending_edit
                 .as_ref()
-                .map_or(false, |(change, _)| change.new.end < self.new_end)
+                .is_some_and(|(change, _)| change.new.end < self.new_end)
             {
                 break;
             }