Fake a Block cursor when in Normal mode

[ThatRendle]

Solution for #19 until the Code team provide a better way of styling the cursor.

Slightly hacky solution using textEditor.setDecorations, but it does give a clear visual indicator when you're in Normal mode.

At present you can't set decorations past the end of text on a line, so when the cursor is on an empty line it doesn't show the block.

[jpoon]

Nice! How would this work in Visual mode?

[ThatRendle]

@jpoon This doesn't do anything with Visual Mode, that's a whole other thing which should probably just work with setting actual selections. I don't mind having a go at Visual Mode if you like, seems like this SDK is pretty easy to work with.

[ThatRendle]

Squashed. I can squash now! 😀

[kimitake]

I opened long file and moved cursor by j or k, but window is not scrolled.
Up/Down allow keys work, mouse wheel and scroll bar are working, too.

In addition, the block area becomes big at tab space.

[ThatRendle]

I'll take a look at the scrolling issue. Not sure how much can be done about the big tab space thing, since I've basically used a hack to simulate the block cursor. Question is, is the big cursor a bigger issue than having no visual indicator that you're in Normal mode?

[jpoon]

Please file an issue if you encounter any bugs such that we can track them. I've filed #89 for the scrolling issue with a fix in PR #87

[jpoon]

@andersonj has resolved the conflicts and submitted a new PR. Closing this in favor of #102