Fix: ignore whitespaces pasted in EmotePopup search (#3730)

Co-authored-by: Felanbird <41973452+Felanbird@users.noreply.github.com>
Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>

src/widgets/helper/RegExpItemDelegate.cpp

@@ -1,5 +1,7 @@
 #include "widgets/helper/RegExpItemDelegate.hpp"
 
+#include "widgets/helper/TrimRegExpValidator.hpp"
+
 #include <QLineEdit>
 
 namespace chatterino {
@@ -16,8 +18,7 @@ QWidget *RegExpItemDelegate::createEditor(QWidget *parent,
                                           const QModelIndex &index) const
 {
     auto *editor = new QLineEdit(parent);
-    editor->setValidator(
-        new QRegularExpressionValidator(this->regexp_, editor));
+    editor->setValidator(new TrimRegExpValidator(this->regexp_, editor));
     return editor;
 }