Scroll position in other pane marches downward when Quick Open / Ctrl+T used repeatedly

[peterflynn]

1. Open two files in split view
2. Press Ctrl+T or Ctrl+Shift+O, then Escape
3. Repeat step 2 a bunch of times, staying in the same pane

Result: Scroll position of the other pane keeps moving downward.

This is because the ModalBar code that saves & restores scroll position only fixes up the current editor. It needs to fix up the visible editors in all affected panes.

[peterflynn]

Interestingly, Find / Find in Files don't exhibit this bug. I have no idea how that could possibly work.

If there's really a simple way to make it work without tracking every pane's editor simultaneously (as is implied by Find working fine), it would be awesome to use that to fix Quick Open too. I just don't understand it yet...

CC @njx since he wrote this ModalBar logic originally... in case there's anything obvious I'm missing here.

[JeffryBooher]

This logic lives in modalbar.js which does use the main view manager equivalent to save / restore the scroll state. I'll take a look.

[JeffryBooher]

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