Introduce AutoindentMode parameter to Buffer::edit

This controls whether or not we preserve the relative indentation
of inserted text blocks.

Co-authored-by: Mikayla Maki <mikayla.c.maki@gmail.com>

crates/editor/src/display_map/block_map.rs

@@ -1164,7 +1164,7 @@ mod tests {
 
         // Insert a line break, separating two block decorations into separate lines.
         let buffer_snapshot = buffer.update(cx, |buffer, cx| {
-            buffer.edit([(Point::new(1, 1)..Point::new(1, 1), "!!!\n")], cx);
+            buffer.edit([(Point::new(1, 1)..Point::new(1, 1), "!!!\n")], None, cx);
             buffer.snapshot(cx)
         });
 

crates/editor/src/display_map/fold_map.rs

@@ -1240,6 +1240,7 @@ mod tests {
                     (Point::new(0, 0)..Point::new(0, 1), "123"),
                     (Point::new(2, 3)..Point::new(2, 3), "123"),
                 ],
+                None,
                 cx,
             );
             buffer.snapshot(cx)
@@ -1262,7 +1263,7 @@ mod tests {
         );
 
         let buffer_snapshot = buffer.update(cx, |buffer, cx| {
-            buffer.edit([(Point::new(2, 6)..Point::new(4, 3), "456")], cx);
+            buffer.edit([(Point::new(2, 6)..Point::new(4, 3), "456")], None, cx);
             buffer.snapshot(cx)
         });
         let (snapshot4, _) = map.read(buffer_snapshot.clone(), subscription.consume().into_inner());
@@ -1318,7 +1319,7 @@ mod tests {
 
             // Edit within one of the folds.
             let buffer_snapshot = buffer.update(cx, |buffer, cx| {
-                buffer.edit([(0..1, "12345")], cx);
+                buffer.edit([(0..1, "12345")], None, cx);
                 buffer.snapshot(cx)
             });
             let (snapshot, _) =
@@ -1360,7 +1361,7 @@ mod tests {
         assert_eq!(snapshot.text(), "aa…cccc\nd…eeeee");
 
         let buffer_snapshot = buffer.update(cx, |buffer, cx| {
-            buffer.edit([(Point::new(2, 2)..Point::new(3, 1), "")], cx);
+            buffer.edit([(Point::new(2, 2)..Point::new(3, 1), "")], None, cx);
             buffer.snapshot(cx)
         });
         let (snapshot, _) = map.read(buffer_snapshot.clone(), subscription.consume().into_inner());