Assistant: Debounce text input on_change event

This prevents unnecessary queries being executed when pasting text
or typing very quickly. The debounce timeout is 5ms, which is half the
rate at which the UI is updated. Therefore, there should be no
noticable impact on user experience.

1 files changed, 4 insertions, 2 deletions

diff --git a/Userland/Applications/Assistant/main.cpp b/Userland/Applications/Assistant/main.cpp
index d2b4ea61ab..028893d0a1 100644
--- a/Userland/Applications/Assistant/main.cpp
+++ b/Userland/Applications/Assistant/main.cpp
@@ -12,6 +12,7 @@
 #include <AK/LexicalPath.h>
 #include <AK/QuickSort.h>
 #include <AK/Try.h>
+#include <LibCore/Debounce.h>
 #include <LibCore/LockFile.h>
 #include <LibCore/System.h>
 #include <LibDesktop/Launcher.h>
@@ -195,7 +196,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         }
     };
 
-    text_box.on_change = [&]() {
+    text_box.on_change = Core::debounce([&]() {
         {
             Threading::MutexLocker locker(app_state.lock);
             if (app_state.last_query == text_box.text())
@@ -205,7 +206,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         }
 
         db.search(text_box.text());
-    };
+    },
+        5);
     text_box.on_return_pressed = [&]() {
         if (!app_state.selected_index.has_value())
             return;