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Using the "alternate screen" capability, the RawTerminal trait restores
the terminal in its previous state by sending the proper escape codes.

Move the check to the beginning of the loop to protect against empty buffer.

We use click and drag.

* modify Keys and Events to detect Esc key presses

The strategy used here is to read two bytes at a time, going on the
assumption that escape sequences will consist of multi byte reads and
solitary Esc key presses will consist of single byte reads.

Tests had to be modified to account for these new multi byte reads by
including dummy bytes when a single byte was previously expected.

Fixes ticki/termion#43

* expand keys example to include Esc key presses

* add test for Esc key press

Commit 0d1025c5 changed the signature of
is_tty, but the example was not updated.

Fix the documentation link and format it better.

This adds support for the escape codes generated in rxvt and xterm
format by holding a button and moving the mouse around.

Instead of outdated self-hosted docs, we let the awesome
[docs.rs](https://docs.rs) do the job for us.

Update keys.rs

fix message not appearing

Add escapes to undo styles

Allow colors to be reset to terminal defaults