Unnecessary scrolling up to first line, when undo reformat after saving file.

Preconditions:

• plugin ClangFormat on
• Option -> C++ -> Code style: Format edited code on file save; checked
• Source code file with more lines that window 

How to reproduce:

• scroll down
• type something to force refactor tool to break line (for example in one line type: cout << "Hello World!" << endl;cout << "Hello World2!" << endl; )
• save file (Ctrl + s)
• undo (Ctrl + z)

Effect (100% reproducible):

Text editor scroll unnecessary up to the first line.