Remove prefix filtering from autocomplete menu

PR helix-editor#4134 switched the autocomplete menu from alphabetical to fuzzy
sorting. 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;