UI/Qt: Restore address bar URL when pressing Escape

When the user focuses the address bar and presses Escape, the original
URL is now restored. Previously, the address bar would show whatever
text the user had typed, or be empty if they had cleared it.

This matches the AppKit implementation and Chrome/Firefox behavior.

Fixes https://github.com/LadybirdBrowser/ladybird/issues/7264

UI/Qt/LocationEdit.cpp

@@ -12,6 +12,7 @@
 #include <UI/Qt/StringUtils.h>
 
 #include <QApplication>
+#include <QKeyEvent>
 #include <QPalette>
 #include <QTextLayout>
 #include <QTimer>
@@ -77,6 +78,20 @@ void LocationEdit::focusOutEvent(QFocusEvent* event)
     }
 }
 
+void LocationEdit::keyPressEvent(QKeyEvent* event)
+{
+    if (event->key() == Qt::Key_Escape) {
+        if (m_autocomplete->popup()->isVisible()) {
+            QLineEdit::keyPressEvent(event);
+            return;
+        }
+        setText(qstring_from_ak_string(m_url.serialize()));
+        clearFocus();
+        return;
+    }
+    QLineEdit::keyPressEvent(event);
+}
+
 void LocationEdit::search_engine_changed()
 {
     update_placeholder();

UI/Qt/LocationEdit.h

@@ -32,6 +32,7 @@ public:
 private:
     virtual void focusInEvent(QFocusEvent* event) override;
     virtual void focusOutEvent(QFocusEvent* event) override;
+    virtual void keyPressEvent(QKeyEvent* event) override;
 
     virtual void search_engine_changed() override;