Exception thrown in Firefox 2 when opening the root context menu with keyboard

[simonjb]

To reproduce:

1. open dijit/tests/test_Menu.html in Firefox 2
2. press shift-f10

Expected:

• menu to open

Actual:

• Exception "Could not convert JavaScript argument" nsresult: "0x80570009 (NS_ERROR_XPC_BAD_CONVERT_JS)"

[simonjb]

Thrown by getComputedStyle() in dojo/_base/html.js. Investigating.

[simonjb]

The Exception is thrown whenever dojo.getComputedStyle() is called on an HTMLDocument. The Exception is thrown by this line:

return dv.getComputedStyle(node, null);

where dv = document.defaultView

The trace goes like this:

• Menu._openMyself(): e.target=HTML Element
• dojo.coords(): node=HTML Element
• dojo.getComputedStyle(): node=HTML Element
• dojo._getMarginBox(): calls gcs(p) with p=HTMLDocument (where gcs is dojo.getComputedStyle and p is node.parentNode)
• dojo.getComputedStyle(): node=HTMLDocument
• Exception

[simonjb]

I've been chatting with sjmiles and he is going to take a look at this.

[sjmiles]

(In [9477]) Prevent _getMarginBox and _sumAncestorProperties from calling getComputedStyle on non style-bearing objects (i.e. document). Refs #3620.