Passthrough is_snippet for non-structured snippets

Structured snippets precisely track which text edits need to be marked
as snippet text edits, but the cases where structured snippets aren't
used but snippets are still present are for simple single text-edit
changes, so it's perfectly fine to mark all one of them as being a
snippet text edit

Author: DropDemBits

crates/rust-analyzer/src/to_proto.rs

@@ -887,12 +887,8 @@ fn outside_workspace_annotation_id() -> String {
 fn merge_text_and_snippet_edits(
     line_index: &LineIndex,
     edit: TextEdit,
-    snippet_edit: Option<SnippetEdit>,
+    snippet_edit: SnippetEdit,
 ) -> Vec<SnippetTextEdit> {
-    let Some(snippet_edit) = snippet_edit else {
-        return edit.into_iter().map(|it| snippet_text_edit(&line_index, false, it)).collect();
-    };
-
     let mut edits: Vec<SnippetTextEdit> = vec![];
     let mut snippets = snippet_edit.into_edit_ranges().into_iter().peekable();
     let mut text_edits = edit.into_iter();
@@ -1009,13 +1005,18 @@ fn merge_text_and_snippet_edits(
 
 pub(crate) fn snippet_text_document_edit(
     snap: &GlobalStateSnapshot,
+    is_snippet: bool,
     file_id: FileId,
     edit: TextEdit,
     snippet_edit: Option<SnippetEdit>,
 ) -> Cancellable<lsp_ext::SnippetTextDocumentEdit> {
     let text_document = optional_versioned_text_document_identifier(snap, file_id);
     let line_index = snap.file_line_index(file_id)?;
-    let mut edits = merge_text_and_snippet_edits(&line_index, edit, snippet_edit);
+    let mut edits = if let Some(snippet_edit) = snippet_edit {
+        merge_text_and_snippet_edits(&line_index, edit, snippet_edit)
+    } else {
+        edit.into_iter().map(|it| snippet_text_edit(&line_index, is_snippet, it)).collect()
+    };
 
     if snap.analysis.is_library_file(file_id)? && snap.config.change_annotation_support() {
         for edit in &mut edits {
@@ -1098,9 +1099,10 @@ pub(crate) fn snippet_workspace_edit(
     for (file_id, (edit, snippet_edit)) in source_change.source_file_edits {
         let edit = snippet_text_document_edit(
             snap,
+            source_change.is_snippet,
             file_id,
             edit,
-            snippet_edit.filter(|_| source_change.is_snippet),
+            snippet_edit,
         )?;
         document_changes.push(lsp_ext::SnippetDocumentChangeOperation::Edit(edit));
     }