Remove prefix filtering from autocomplete menu

This commit removes the still existing filtering by prefix and should
enable full fuzzy sorting of the autocomplete menu.

closes helix-editor#3084, helix-editor#1807

helix-term/src/commands.rs

@@ -3912,7 +3912,6 @@ pub fn completion(cx: &mut Context) {
     iter.reverse();
     let offset = iter.take_while(|ch| chars::char_is_word(*ch)).count();
     let start_offset = cursor.saturating_sub(offset);
-    let prefix = text.slice(start_offset..cursor).to_string();
 
     cx.callback(
         future,
@@ -3922,7 +3921,7 @@ pub fn completion(cx: &mut Context) {
                 return;
             }
 
-            let mut items = match response {
+            let items = match response {
                 Some(lsp::CompletionResponse::Array(items)) => items,
                 // TODO: do something with is_incomplete
                 Some(lsp::CompletionResponse::List(lsp::CompletionList {
@@ -3932,18 +3931,6 @@ pub fn completion(cx: &mut Context) {
                 None => Vec::new(),
             };
 
-            if !prefix.is_empty() {
-                items = items
-                    .into_iter()
-                    .filter(|item| {
-                        item.filter_text
-                            .as_ref()
-                            .unwrap_or(&item.label)
-                            .starts_with(&prefix)
-                    })
-                    .collect();
-            }
-
             if items.is_empty() {
                 // editor.set_error("No completion available");
                 return;