Silence debug warnings on `expand` failure (#49)

Fix error while highlighting due to invalid value being set to 'winwidth'

Fix positioning for the substitute preview when range is omitted

Preview substitute only on the lines that are visible

Fix incompatibility with 'inccommand' by turning it off

Disable :normal preview in command-line window

Fix undo history getting lost when using 'u' during :normal preview

Update docs

Add missing command modifiers

Fix getting stuck in visual mode during :normal preview

Prevent errors during :normal preview

Update docs

Restore Visual area marks after :normal preview

Add more inspiration

Fix :normal preview on Neovim