Subview Click Assertion

BUG ID: Bugzilla bug 9984 ASSERTION FAILURE: _private->mouseDownEvent != nil (WebKit/WebView/WebHTMLView.m:4863 -[WebHTMLView(WebInternal) _delegateDragSourceActionMask])

STEPS TO TEST: Open this test in a new Safari window. In the new window, click once on the text “Click me”. Do not click anywhere else in the window before clicking the text.

TEST PASS: The text will be deselected.

TEST FAIL: An assertion failure will occur.