Editor2: dojo._ie_clobber error when unloading the page

[liucougar]

go to test_Editor2.html in IE

click the "clobber" button on the top

reload the page, and you will receive an error: "permission denied" in src/event/browser.js, line 37 (reported by ie js debugger)

however, before clobbering all the editors, focus in either the second editor or the third in the page (by clicking in them), upon unloading, no errors are reported anymore. (focus in the first instance of editor does not help at all.)

[liucougar]

peller can reproduce this issue

focusing in the 2rd/3rd does not help in his case at all

in bill's IE, IE always crashes

currently no clue about this

[liucougar]

(In [5451]) fixes #1375 Editor2: dojo._ie_clobber error when unloading the page: squelch error in dojo._ie_clobber to prevent error when the node is no longer available (tested with drip-0.5, no memory leak is introduced with this)

[(none)]

Milestone 0.4 deleted