Before this change up and down were in display co-ordinates, after this
change they are in fold coordinates (which matches the vim behaviour).
To make this work without causing usabliity problems, a bunch of extra
keyboard shortcuts now work:
- vim: `z {o,c}` to open,close a fold
- vim: `z f` to fold current visual selection
- vim: `g {j,k,up,down}` to move up/down a display line
- vim: `g {0,^,$,home,end}` to get to start/end of a display line
Fixes: zed-industries/community#1562
- vim: support P for paste before
- vim: support P in visual mode for paste without overriding clipboard
- vim: fix position when using `p` on text copied outside zed
- vim: fix indentation when using `p` on text copied from zed
This isn't quite an exact emulation, as instead of using one selection
that is magically in "column mode", we emulate it with a bunch of zed
multi-selections (one per line).
I think this is better, as it requires fewer changes to the codebase,
and lets you see the impact of any changes immediately on all lines.
Fixes: zed-industries/community#984
Added .assert_shared_state() to NeovimBackedTestContext – although it's
not strictly necessary to show the expected behaviour in the test file
(as we can just compare to neovim's JSON recording), it makes it much
easier to understand what we're testing.
