Improve navigation in Single Page view
OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 22.214.171.1241459983, revision: 465e7b6
In Single Page view there is no convenient way of navigating quickly across large stretches of the score. (1) There is no vertical scroll bar (2) The navigator doesn't work. (3) Find page (Pxx) does not work (4) The Page Up/down commands don't work.