[Move refactor] Reparent orphan classes (#6236)

* Move orphaned classes to their correct parent folders.

---------

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

cockatrice/src/interface/widgets/utility/custom_line_edit.h

@@ -0,0 +1,52 @@
+/**
+ * @file custom_line_edit.h
+ * @ingroup UI
+ * @brief TODO: Document this.
+ */
+
+#ifndef CUSTOMLINEEDIT_H
+#define CUSTOMLINEEDIT_H
+
+#include <QLineEdit>
+
+class QTreeView;
+class QKeyEvent;
+class QWidget;
+class QString;
+
+// Should be used when the there is a risk of conflict between line editor
+// shortcuts and other shortcuts
+class LineEditUnfocusable : public QLineEdit
+{
+    Q_OBJECT
+public:
+    explicit LineEditUnfocusable(QWidget *parent = nullptr);
+    explicit LineEditUnfocusable(const QString &contents, QWidget *parent = nullptr);
+
+private:
+    static bool isUnfocusShortcut(QKeyEvent *key);
+
+protected:
+    void keyPressEvent(QKeyEvent *event) override;
+    bool eventFilter(QObject *watched, QEvent *event) override;
+};
+
+class SearchLineEdit : public LineEditUnfocusable
+{
+private:
+    QTreeView *treeView;
+
+protected:
+    void keyPressEvent(QKeyEvent *event) override;
+
+public:
+    SearchLineEdit() : treeView(nullptr)
+    {
+    }
+    void setTreeView(QTreeView *_treeView)
+    {
+        treeView = _treeView;
+    }
+};
+
+#endif