PathChooser: Move setTextKeepingActiveCursor() to FancyLineEdit

We want to re-use it elsewhere.

Change-Id: Iadb03e2e85bc25f9111a8817170b9ec1f2f0a7b1
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/utils/fancylineedit.cpp

@@ -27,6 +27,7 @@
 #include "fancylineedit.h"
 #include "historycompleter.h"
 #include "hostosinfo.h"
+#include "optional.h"
 #include "qtcassert.h"
 #include "stylehelper.h"
 #include "utilsicons.h"
@@ -175,6 +176,14 @@ FancyLineEdit::~FancyLineEdit()
     }
 }
 
+void FancyLineEdit::setTextKeepingActiveCursor(const QString &text)
+{
+    optional<int> cursor = hasFocus() ? make_optional(cursorPosition()) : nullopt;
+    setText(text);
+    if (cursor)
+        setCursorPosition(*cursor);
+}
+
 void FancyLineEdit::setButtonVisible(Side side, bool visible)
 {
     d->m_iconbutton[side]->setVisible(visible);