614949 - DOMWalker can't find nodes where the parents don't have them as children

Status: RESOLVED FIXED

(Mozilla QA Graveyard :: Mozmill Tests, defect)

Description

[Adrian Kalla [:adriank]]

Attachment: *ugly* patch which catches nodes hidden under object._buttons

During testing on Windows and Linux I noticed, that not all duplicated access keys were catch. After some debugging I've found out, that we have nodes in the tree which have a parent node, but that parent node does not list them as children, so they won't be found by the current DOMWalker.

The only case I've found for now is the "_buttons" object of "BrowserPreferences", which holds the "OK", "Cancel" and "Help" buttons for the Preferences window on Windows and Linux (and on Mac the "Help" icon of the subwindows of the Preferences window). 
To see the difference in the results, the attached ugly patch has to be applied. A good example to test is Polish Fx 4.0b6.

I'm not sure if "_buttons" is the only case, or if there are more ones. Knowing the reality, I guess it'll be the latter one. 
I still have to think how to solve it right... But one thing for sure: it'll require changes to the _walk-method.

Comment 1

[Henrik Skupin [:whimboo][⌚️UTC+2]]

Can you please give a link to the appropriate line in the XUL file?

Comment 2

[Adrian Kalla [:adriank]]

Comment on attachment 493404 [details] [diff] [review]
*ugly* patch which catches nodes hidden under object._buttons

http://mxr.mozilla.org/mozilla-central/source/toolkit/content/widgets/preferences.xml#575

Comment 3

[Henrik Skupin [:whimboo][⌚️UTC+2]]

All those buttons are childNodes of the hbox. Not sure which parent do you mean in detail here?

Comment 4

[Adrian Kalla [:adriank]]

Attachment: test case for parent-less children

A short test case showing that we can get from child-node through the parent-node to the grand-parent-node, but in case of _buttons, we can't go the other way around, as the grand-parent-node is missing the parent-nodes in the childNodes list.

Comment 5

[Adrian Kalla [:adriank]]

Attachment: proposed work-around

I'd propose, as long as no one finds a better solution, to use this work-around. Without checking the "node._buttons" object, we miss most of the existing duplicated access keys.

Comment 6

[Henrik Skupin [:whimboo][⌚️UTC+2]]

Comment on attachment 500562 [details] [diff] [review]
proposed work-around

Looks great and works great! We even have duplicated access keys in the en-US locale! Can you please create a final patch via export?

Comment 7

[Adrian Kalla [:adriank]]

Attachment: workaround-patch

(In reply to comment #6)
> Comment on attachment 500562 [details] [diff] [review]
> proposed work-around
> 
> Looks great and works great! We even have duplicated access keys in the en-US
> locale! Can you please create a final patch via export?

done

Comment 8

[Henrik Skupin [:whimboo][⌚️UTC+2]]

Landed as:
http://hg.mozilla.org/qa/mozmill-tests/rev/064337b98c94 (default)
http://hg.mozilla.org/qa/mozmill-tests/rev/c3f054b43c4e (1.9.2)

I will file new bugs for the duplicated access keys in en-US. Woot!