Scroll View proposal

In another thread, I suggested a possible way to implement something like Finale's "scroll view" without completely altering the architecture of the program. Simply implement a command that temporarily sets page size to something just tall enough to fit one system, and is arbitrarily wide. The command should be a toggle, so hitting it again restores the original page size.

I just tried taking a score, removing all line and page breaks, and setting my page size to 2000x60mm. I had to also set the plastic line fill threshold to 100% so it didn't try to stretch my music out unnecessarily. It instantly looks, feels, and works a whole lot like Finale's scroll view. Playback scrolls just fine, as does horizontal scrolling via mouse wheel. Missing is page up/down to scroll via keyboard. But I'd argue that many would want page up/down to work system by system even in "regular" view. Even word processors don't really move to the next physical page with those keys - they go a screenful at a time. I'd suggest that page up/down should do something similar in MuseScore, with Ctrl-Page Up/Down or something similar to actually move by page.

The scroll view should probably suppress display of vertical frames. Right now the title ends up taking up a whole giant page to itself. It should also disable the hide empty staves option. Probably a couple other details to iron out here and there. But it actually works well enough as is that I may start using this technique when initially entering my music. And that's the only time I would generally want this mode, anyhow. I don't normally start worrying about line or page breaks until I'm basically done with note entry, so I don't even care is MuseScore ignores line/page breaks during initial note entry. I'd then switch to regular view, add my breaks there, and not actually care so much what MuseScore did should I for some reaosn go back to scroll view.

BTW, it seems like the only thing needed to implement a fairly useful plug-in to automate the toggling would be a way to set the last system fill threshold, and a way to store the original value of this and also the "real" page size with the document should someone save it while in "scroll" view. I suppose, if nothing else, a plug-in could potentially store that info in a sidecar file. A plugiin could possibly even delete line breaks (not sure about page breaks) but save their locations for later restoration. But it would be better if there were support for hiding vertical frames, setting the hide empty staves option, etc.