CSS code hints overwrite 1 char too many on current line

[peterflynn]

1. Start with this code, all on one line: body {margin:0}
2. Place the cursor between "0" and "}"
3. Type ;col
4. Select 'color' from the code hint popup

Result: "}" is overwritten, so the code is now body {margin:0;color:

Expected: the code is now body {margin:0;color:}

If there are more chars after the "}" they're preserved though... e.g. body {margin:0}div{} -> body {margin:0;color:div{}

[RaymondLim]

FBNC to @peterflynn

[peterflynn]

Looks good! @RaymondLim do you have cycles to add a unit test for this? I feel like this is the sort of thing we could quickly add a regression test for...