Fix split focusing being broken in certain circumstances when the "Show input when it's empty" setting was disabled (#3838)

Co-authored-by: Kasia <zneix@zneix.eu>

src/widgets/helper/ResizingTextEdit.hpp

@@ -43,7 +43,8 @@ private:
     QCompleter *completer_ = nullptr;
     bool completionInProgress_ = false;
 
-    bool eventFilter(QObject *widget, QEvent *event) override;
+    bool eventFilter(QObject *obj, QEvent *event) override;
+
 private slots:
     void insertCompletion(const QString &completion);
 };