LibWeb: Don't update input text if Ctrl or Alt are pressed

With this change, input elements ignore keypresses while Ctrl or Alt
are pressed. This matches the behavior of Chrome and Firefox

Userland/Libraries/LibWeb/Page/EventHandler.cpp

@@ -689,10 +689,12 @@ bool EventHandler::focus_previous_element()
     return element;
 }
 
-constexpr bool should_ignore_keydown_event(u32 code_point)
+constexpr bool should_ignore_keydown_event(u32 code_point, u32 modifiers)
 {
+    if (modifiers & (KeyModifier::Mod_Ctrl | KeyModifier::Mod_Alt))
+        return true;
+
     // FIXME: There are probably also keys with non-zero code points that should be filtered out.
-    // FIXME: We should take the modifier keys into consideration somehow. This treats "Ctrl+C" as just "c".
     return code_point == 0 || code_point == 27;
 }
 
@@ -755,7 +757,8 @@ bool EventHandler::handle_keydown(KeyCode key, u32 modifiers, u32 code_point)
                 m_edit_event_handler->handle_delete(*range);
                 return true;
             }
-            if (!should_ignore_keydown_event(code_point)) {
+            // FIXME: Text editing shortcut keys (copy/paste etc.) should be handled here.
+            if (!should_ignore_keydown_event(code_point, modifiers)) {
                 m_edit_event_handler->handle_delete(*range);
                 m_edit_event_handler->handle_insert(JS::NonnullGCPtr { *m_browsing_context->cursor_position() }, code_point);
                 m_browsing_context->increment_cursor_position_offset();
@@ -818,7 +821,8 @@ bool EventHandler::handle_keydown(KeyCode key, u32 modifiers, u32 code_point)
             input_element.commit_pending_changes();
             return true;
         }
-        if (!should_ignore_keydown_event(code_point)) {
+        // FIXME: Text editing shortcut keys (copy/paste etc.) should be handled here.
+        if (!should_ignore_keydown_event(code_point, modifiers)) {
             m_edit_event_handler->handle_insert(JS::NonnullGCPtr { *m_browsing_context->cursor_position() }, code_point);
             m_browsing_context->increment_cursor_position_offset();
             return true;