global_search: Save search when accepting an option (helix-editor#11209)

The Prompt is set up to push the current line to history when hitting
Enter but the Picker doesn't pass the Enter event down to the Prompt
(for good reason: we don't want the Prompt's behavior of changing
completions when we hit a path separator). We should save the Prompt's
line to its configured history register when hitting Enter when there
is a selection in the Picker.

This currently only applies to `global_search`'s Picker since it's the
only Picker to use `Picker::with_history_register`.

helix-term/src/ui/picker.rs

@@ -1031,6 +1031,7 @@ impl<I: 'static + Send + Sync, D: 'static + Send + Sync> Component for Picker<I,
                     self.handle_prompt_change();
                 } else {
                     if let Some(option) = self.selection() {
+                        self.prompt.save_line_to_history(ctx.editor);
                         (self.callback_fn)(ctx, option, Action::Replace);
                     }
                     return close_fn(self);

helix-term/src/ui/prompt.rs

@@ -516,6 +516,16 @@ impl Prompt {
             surface.set_string(line_area.x, line_area.y, self.line.clone(), prompt_color);
         }
     }
+
+    /// Saves the current line to the configured history register, if there is one.
+    pub(crate) fn save_line_to_history(&self, editor: &mut Editor) {
+        let Some(register) = self.history_register else {
+            return;
+        };
+        if let Err(err) = editor.registers.push(register, self.line.clone()) {
+            editor.set_error(err.to_string());
+        }
+    }
 }
 
 impl Component for Prompt {
@@ -603,14 +613,7 @@ impl Component for Prompt {
                         &last_item
                     } else {
                         if last_item != self.line {
-                            // store in history
-                            if let Some(register) = self.history_register {
-                                if let Err(err) =
-                                    cx.editor.registers.push(register, self.line.clone())
-                                {
-                                    cx.editor.set_error(err.to_string());
-                                }
-                            };
+                            self.save_line_to_history(cx.editor);
                         }
 
                         &self.line