edit predictions: Don't animate cursor when jumping in eager mode without LSP completions (#24664)

We should only do this in "holding modifier" mode OR when there's a
language server completions menu.

Release Notes:

- N/A

crates/editor/src/editor.rs

@@ -5457,20 +5457,28 @@ impl Editor {
         };
 
         if &accept_keystroke.modifiers == modifiers {
-            if let Some(completion) = self.active_inline_completion.as_ref() {
+            let Some(completion) = self.active_inline_completion.as_ref() else {
-                if self.edit_prediction_preview.start(
+                return;
+            };
+
+            if !self.edit_prediction_requires_modifier() && !self.has_visible_completions_menu() {
+                return;
+            }
+
+            let transitioned = self.edit_prediction_preview.start(
                 &completion.completion,
                 &position_map.snapshot,
                 self.selections
                     .newest_anchor()
                     .head()
                     .to_display_point(&position_map.snapshot),
-                ) {
+            );
+
+            if transitioned {
                 self.request_autoscroll(Autoscroll::fit(), cx);
                 self.update_visible_inline_completion(window, cx);
                 cx.notify();
             }
-            }
         } else if self.edit_prediction_preview.end(
             self.selections
                 .newest_anchor()