fix: Never create automatic doc popups outside of Insert mode (helix-editor#4456)

Author: poliorcetics

helix-term/src/commands/lsp.rs

@@ -9,7 +9,7 @@ use tui::text::{Span, Spans};
 use super::{align_view, push_jump, Align, Context, Editor, Open};
 
 use helix_core::{path, Selection};
-use helix_view::{apply_transaction, editor::Action, theme::Style};
+use helix_view::{apply_transaction, document::Mode, editor::Action, theme::Style};
 
 use crate::{
     compositor::{self, Compositor},
@@ -957,6 +957,14 @@ pub fn signature_help_impl(cx: &mut Context, invoked: SignatureHelpInvoked) {
                 return;
             }
 
+            // If the signature help invocation is automatic, don't show it outside of Insert Mode:
+            // it very probably means the server was a little slow to respond and the user has
+            // already moved on to something else, making a signature help popup will just be an
+            // annoyance, see https://github.com/helix-editor/helix/issues/3112
+            if !was_manually_invoked && editor.mode != Mode::Insert {
+                return;
+            }
+
             let response = match response {
                 // According to the spec the response should be None if there
                 // are no signatures, but some servers don't follow this.