Do not automatically decide to use alternate screen when the value of
height exceeds the height of the terminal.

    # Use alternate screen
    fzf
    fzf --height 100%
    fzf --no-height

    # Still use current screen
    fzf --height 10000

Close #858
https://github.com/junegunn/fzf/commit/3a6af27586c65bb9243c5af7c43a40619503db52#commitcomment-21135641

This reverts commit 3a6af275.

CTRL-R binding used to start with --no-sort to list the matched commands
in chronological order. However, it has been a constant source of
confusion. Let's enable it by default from now on. The sorted result
shouldn't be too confusing as we use --tiebreak=index.

This is to address a common confusion that one does not realize that
sorting is intentionally turned off by default and can be enabled by
a bind key.

https://github.com/junegunn/fzf.vim/issues/327
https://github.com/junegunn/fzf.vim/issues/317

Close #858

This is needed when fzf is started from inside a program (e.g. Vim)
and it uses a different background color than the terminal.

- https://github.com/junegunn/fzf.vim/issues/325
- https://github.com/junegunn/fzf.vim/issues/300

Close https://github.com/junegunn/fzf.vim/issues/308

- call fzf#run({'source': "echo '!'"})
- call fzf#run({'source': "echo '!'", 'down': '40%'})

Close https://github.com/junegunn/fzf.vim/issues/315

Close #847. Patch submitted by @wontoncc.

Close https://github.com/junegunn/fzf.vim/issues/309

Fix broken preview border. Reported by Thomas Sattler.

    fzf --bind 'enter:execute(date)' --preview=date --reverse

Using a dummy command that works as the barrier.

Due to the recent removal of ncurses dependency, we can cross-compile
binaries for different platforms without virtual machines.

Related #832

To override --height option in FZF_DEFAULT_OPTS

Goes well with --height

Due to performance consideration, FuzzyMatchV2 does not return the exact
positions of the matching characters by default. However, the ommission
caused `--tiebreak=begin` to produce inaccurate result in some cases.

  (echo baz foo bar; echo foo bar baz) | fzf --tiebreak=begin -fbar | head -1

  # Expected: foo bar baz
  # Actual:   baz foo bar

This commit fixes the problem by using the end offset which is
guaranteed to be correct.