multi_buffer: Remove redundant buffer id field (#43459)

It is easy for us to get the two fields out of sync causing weird
problems, there is no reason to have both here so.

Release Notes:

- N/A *or* Added/Fixed/Improved ...

Co-authored by: Antonio Scandurra <antonio@zed.dev>

crates/language/src/buffer_tests.rs

@@ -3427,7 +3427,7 @@ fn test_random_collaboration(cx: &mut App, mut rng: StdRng) {
     for buffer in &buffers {
         let buffer = buffer.read(cx).snapshot();
         let actual_remote_selections = buffer
-            .selections_in_range(Anchor::MIN..Anchor::MAX, false)
+            .selections_in_range(Anchor::min_max_range_for_buffer(buffer.remote_id()), false)
             .map(|(replica_id, _, _, selections)| (replica_id, selections.collect::<Vec<_>>()))
             .collect::<Vec<_>>();
         let expected_remote_selections = active_selections

crates/language/src/syntax_map.rs

@@ -330,7 +330,7 @@ impl SyntaxSnapshot {
                 let slice = cursor.slice(
                     &SyntaxLayerPosition {
                         depth: depth + 1,
-                        range: Anchor::MIN..Anchor::MAX,
+                        range: Anchor::min_max_range_for_buffer(text.remote_id()),
                         language: None,
                     },
                     Bias::Left,
@@ -493,7 +493,7 @@ impl SyntaxSnapshot {
                 start_point: Point::zero().to_ts_point(),
                 end_point: text.max_point().to_ts_point(),
             }],
-            range: Anchor::MIN..Anchor::MAX,
+            range: Anchor::min_max_range_for_buffer(text.remote_id()),
             mode: ParseMode::Single,
         });
 
@@ -515,7 +515,7 @@ impl SyntaxSnapshot {
             } else {
                 SyntaxLayerPosition {
                     depth: max_depth + 1,
-                    range: Anchor::MAX..Anchor::MAX,
+                    range: Anchor::min_max_range_for_buffer(text.remote_id()),
                     language: None,
                 }
             };