GUI: LineEdit: Fix cursor jumping to the end when editing

The issue was that editing the text triggers the change of the option,
which in turn triggers updateUiState which sets the content of the
LineEdit to the changed option causing the cursor to jump to the end.

As a workaround only set the LineEdit contet when it's not focused.

Author: mpiatka

gui/QT/option/lineedit_ui.cpp

@@ -13,7 +13,8 @@ void LineEditUi::connectSignals(){
 }
 
 void LineEditUi::updateUiState(const std::string &text){
-	line->setText(QString::fromStdString(text));
+	if(!line->hasFocus())
+		line->setText(QString::fromStdString(text));
 }
 
 void LineEditUi::updateUiState(){