.width() and .height() flickering and inefficiency

[arrix]

.width() and .height() are probably the most useful functions in complex UI programming. But there are some annoying defects

1. resetting borderWidth/Height and paddingWidth/Height causes flickers. see #1613
2. changing the css position of the parent elements in certain cases cause undesired side effects. e.g. #1415
3. cloning invisible elements could be inefficient, especially when the element has many descendants

for # 1, I suggest we minus the padding/border from client/offsetWdith/Height.

for # 2, I'm not sure why the position:relative is needed. if it were to gain layout in IE, then I would suggest zoom:1

for # 3, I suggest we move the element off screen and make it visible instead of cloning.

[brandon]

A possible patch

[brandon]

This passes the test suite except in Opera where a couple of fx tests fail but if you run the failed tests individually, they pass. I haven't done much testing outside the test suite.

[davidserduke]

test case demo'ing an error in Opera that this patch reveals

[davidserduke]

new proposed patch

[brandon]

Fixed in Rev [4100].