[app_server] View positions goes out of sync during update session

[X512]

This is hrev53696.

When resizing window, background erased at wrong positions sometimes. Observed on slow machine or during heavy drawing.

Issue caused by moving of views on server side using resizing mask when window is resized. View positions should be locked during update session.

[X512]

Resizing of layout based view. Note that background is displayed at wrong position.

[jscipione]

I believe that this is a duplicate of https://dev.haiku-os.org/ticket/7010 which is demonstrated by the test program on https://dev.haiku-os.org/ticket/9884