Header, Footer, Numbers window expands off screen when moved [2.0 regression]

Steps to reproduce bug
1. From the main menu choose Style > General...
2. In the left pane choose "Header, Footer, Numbers"
3. Click and drag the title bar to move the window

Expected behavior: Window should remain the same size and move with mouse drag

Actual behavior: Window doubles in height and I can end up with both the window close "X" and the cancel button off screen. The first time this happened I didn't know how to continue except to force quit MuseScore (and potentially loose work)

MuseScore version: r. 5536 nightly build

(Operating System: Windows 7)