GUAC-708: Do not allow user selection within text input (in case a user presses Ctrl+A, for example).

GUAC-690: Do not attempt to create empty thumbnails. Do not create thumbnails if client not attached.

GUAC-698: Record last adjusted display metrics before reflowing and possibly affecting those metrics.

GUAC-685: Ignore keycode 229, sent by some browsers during IME composition (see: http://lists.w3.org/Archives/Public/www-dom/2010JulSep/att-0182/keyCode-spec.html).

GUAC-676: Conversion to Guacamole.Display wasn't finished - "transfer" and others still directly used layer.

GUAC-647: Fix auto-fit logic - calculations weren't properly handling very small displays (like 1x1 or 0x0).

GUAC-637: Use setScale() only to set display scale. Update auto-fit checkbox from within setScale().