Fix crash on lsp text edits with invalid ranges (#9649)

helix-lsp/src/lib.rs

@@ -539,6 +539,16 @@ pub mod util {
                 } else {
                     return (0, 0, None);
                 };
+
+                if start > end {
+                    log::error!(
+                        "Invalid LSP text edit start {:?} > end {:?}, discarding",
+                        start,
+                        end
+                    );
+                    return (0, 0, None);
+                }
+
                 (start, end, replacement)
             }),
         )