FakeVim: Fix searching in visual mode and with commands

Search in visual mode should select text up to matched position.

Using commands should work with search movement; e.g. 'd2/needle<CR>'.
Commands should be also properly canceled if search movement fails.

Change-Id: Ic695dccaf3f36ccae2f2b1a93f888d5ba9805a78
Reviewed-by: hjk <hjk121@nokiamail.com>