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;
 }
 

src/widgets/helper/TrimRegExpValidator.cpp

@@ -0,0 +1,17 @@
+#include "widgets/helper/TrimRegExpValidator.hpp"
+
+namespace chatterino {
+
+TrimRegExpValidator::TrimRegExpValidator(const QRegularExpression &re,
+                                         QObject *parent)
+    : QRegularExpressionValidator(re, parent)
+{
+}
+
+QValidator::State TrimRegExpValidator::validate(QString &input, int &pos) const
+{
+    input = input.trimmed();
+    return QRegularExpressionValidator::validate(input, pos);
+}
+
+}  // namespace chatterino

src/widgets/helper/TrimRegExpValidator.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <QRegularExpression>
+#include <QRegularExpressionValidator>
+
+namespace chatterino {
+
+class TrimRegExpValidator : public QRegularExpressionValidator
+{
+    Q_OBJECT
+
+public:
+    TrimRegExpValidator(const QRegularExpression &re,
+                        QObject *parent = nullptr);
+
+    QValidator::State validate(QString &input, int &pos) const override;
+};
+
+}  // namespace chatterino