Cocoa's devdraw is "ready"

[djeannot24, 2011-09-13 15:30:24]

This is not the definitive version of Cocoa's
Devdraw, but this is very near: I have yet to
rewrite comments, to check return values, and to
prevent the memory to grow at each copy/paste :)

There remains at least the following bugs (and I
will try to correct or avoid them):

	Each time we toggle the old fullscreen
	mode (for OS X Snow Leopard), we lose
	keyboard focus until the next "mouse down"
	event.  It seems to be an OS X (Lion?) bug.

	If OS X Lion sets the resize cursor (because we
	are near a window's border) while we use a plan9
	cursor, the latter is not restored after.  It
	seems to be an OS X bug.

	The pinch gesture (that toggle fullscreen) is far
	too easy to trigger.

	If "reimplementswipe" is set:

		very rapid swipes in opposite
		direction give only the first
		swipe;

		vertical swipes are a little too
		difficult to trigger.

	There is sometimes a non-fatal "out of bounds"
	exception during key down events.

	(Most of the time, you will see small black
	rectangles on the window's bottom corners.  They
	appeared when I switched from Quartz API to Cocoa
	API in makeimg().  If those rectangles make some
	of you suffer, we can switch again, if there is no
	alternative.)

Here are other bugs not caused by Devdraw:

	9term's will not paste at the end of a line with a
	paste gesture or with a "cmd+v", but it will with
	a mouse chord.

	On my system, applications sometimes stop
	receiving 3-finger "high-level gesture" or
	3-finger "low-level touch" events, until I scroll
	a little (with 2 fingers).  Then the bug can
	disappear for days, or it can reappear constantly
	for half an hour.  I don't know if it is hardware
	or software related (note: I'm almost always
	running "BetterTouchTool").

(A mail to 9fans will follow.)

[rsc, 2011-09-19 12:59:05]

*** Submitted as 47d455364128 ***

devdraw: update Lion cocoa

R=rsc
CC=plan9port.codebot
http://codereview.appspot.com/5015042

Committer: Russ Cox <rsc@swtch.com>