Fix #6669: Theme preview doesn't return theme to normal (#6694)

* Fix #6669: Theme preview doesn't return theme to normal when delete name with Alt-Backspace

* Fix #6669: Return theme preview to normal theme for all remaining keybinds that change the promt text

helix-term/src/ui/prompt.rs

@@ -511,11 +511,21 @@ impl Component for Prompt {
             ctrl!('e') | key!(End) => self.move_end(),
             ctrl!('a') | key!(Home) => self.move_start(),
             ctrl!('w') | alt!(Backspace) | ctrl!(Backspace) => {
-                self.delete_word_backwards(cx.editor)
+                self.delete_word_backwards(cx.editor);
+                (self.callback_fn)(cx, &self.line, PromptEvent::Update);
+            }
+            alt!('d') | alt!(Delete) | ctrl!(Delete) => {
+                self.delete_word_forwards(cx.editor);
+                (self.callback_fn)(cx, &self.line, PromptEvent::Update);
+            }
+            ctrl!('k') => {
+                self.kill_to_end_of_line(cx.editor);
+                (self.callback_fn)(cx, &self.line, PromptEvent::Update);
+            }
+            ctrl!('u') => {
+                self.kill_to_start_of_line(cx.editor);
+                (self.callback_fn)(cx, &self.line, PromptEvent::Update);
             }
-            alt!('d') | alt!(Delete) | ctrl!(Delete) => self.delete_word_forwards(cx.editor),
-            ctrl!('k') => self.kill_to_end_of_line(cx.editor),
-            ctrl!('u') => self.kill_to_start_of_line(cx.editor),
             ctrl!('h') | key!(Backspace) | shift!(Backspace) => {
                 self.delete_char_backwards(cx.editor);
                 (self.callback_fn)(cx, &self.line, PromptEvent::Update);