Description of the Issue

In view menu - "Synchronize Vertical Scrolling" / "Synchronize Horizontal Scrolling" items - disabled when opening Notepad++ with both views shown.

Steps to Reproduce the Issue

1. Open N++ with several documents
2. Transfer one of the documens to other view. In this moment Synchronize... items are enabled.
3. Close and open N++ again, Synchronize... items are disabled.

Expected Behavior

View->Synchronize... items are enabled.

Actual Behavior

View->Synchronize... items are disabled.

I can see that code for enabling/disabling these items initially is called but it seems to does not work correctly for some reason.

Notepad++ v7.5.9 (64-bit)
Build time : Oct 14 2018 - 15:19:55
Path : C:\Program Files\Notepad++\notepad++.exe
Admin mode : OFF
Local Conf mode : OFF
OS : Windows 8.1 (64-bit)
Plugins : mimeTools.dll DSpellCheck.dll NppConverter.dll PluginManager.dll