edit prediction: Try to fix panic in Buffer::preview_edits (#24654)

We've seen a few crashes in `SyntaxSnapshot::reparse_with_ranges` during
`Buffer::preview_edits`, where an offset conversion fails because it is
out of range.
We are not sure how exactly this is happening. 
Our theory is that the syntax snapshot is using an outdated state when
edits happen in the meantime (while interpolating). This is an attempt
to see if it helps with the panics, hopefully we can revisit this when
we have a better understanding of the issue.


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

Release Notes:

- N/A

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

crates/language/src/buffer.rs

@@ -1102,6 +1102,10 @@ impl Buffer {
         let mut syntax_snapshot = self.syntax_map.lock().snapshot();
         cx.background_executor().spawn(async move {
             if !edits.is_empty() {
+                if let Some(language) = language.clone() {
+                    syntax_snapshot.reparse(&old_snapshot, registry.clone(), language);
+                }
+
                 branch_buffer.edit(edits.iter().cloned());
                 let snapshot = branch_buffer.snapshot();
                 syntax_snapshot.interpolate(&snapshot);