[Webdriver: Set Window Rect] Why we expect no change when only width or height is provided?

[yezhizhen]

The Step 17 of Spec says as long as one is not null, we should set them.

However, following wpt-test expects no change in such situations.

wpt/webdriver/tests/classic/set_window_rect/set.py

Lines 197 to 202 in 2566936

	{"height": 200, "y": 200},
	])
	def test_no_change(session, rect):
	original = session.window.rect
	response = set_window_rect(session, rect)
	assert_success(response, original)

Why? As I checked, the original is also never "200".

[yezhizhen]

cc @jdm @xiaochengh

[yezhizhen]

w3c/webdriver#1906 (comment)
Seems it's just that the test case is out-dated with current standard :D

I will update the test accordingly.