lsp: Resolve completion items missing documentation on idle (#4406)

Some language servers may not send the `documentation` field if it
is expensive to compute. Clients can request the missing field with
a completionItem/resolve request.

In this change we use the idle-timeout event to ensure that the current
completion item is resolved.

1 files changed, 9 insertions, 4 deletions

diff --git a/helix-term/src/ui/editor.rs b/helix-term/src/ui/editor.rs
index 43b1e7a0..b1bb02c7 100644
--- a/helix-term/src/ui/editor.rs
+++ b/helix-term/src/ui/editor.rs
@@ -1097,10 +1097,15 @@ impl EditorView {
     }
 
     pub fn handle_idle_timeout(&mut self, cx: &mut commands::Context) -> EventResult {
-        if self.completion.is_some()
-            || cx.editor.mode != Mode::Insert
-            || !cx.editor.config().auto_completion
-        {
+        if let Some(completion) = &mut self.completion {
+            return if completion.ensure_item_resolved(cx) {
+                EventResult::Consumed(None)
+            } else {
+                EventResult::Ignored(None)
+            };
+        }
+
+        if cx.editor.mode != Mode::Insert || !cx.editor.config().auto_completion {
             return EventResult::Ignored(None);
         }