Context Menu z-index problem when used from toolbar in inline mode

[WebSpellChecker.net]

Can be reproduced when spellcheck control is added to the toolbar (scayt plug-in should be enabled). Spellcheck control on toolbar use contextmenu to show possible actions.

Steps to reproduce:

1. open sample inlineall.html
2. active editor on one of controls
3. RMB on editable area
4. click spellcheck control on toolbar

Expected results: Spellcheck items list is shown over the toolbar

Actual results: Spellcheck items list is shown under the toolbar

If step 3. is excluded then Context Menu is working as expected

[Jakub Ś]

One more note here - if you have done this TC without step 3 you will need to reload the page and go through TC steps one more time.

[Piotrek Koszuliński]

Fixed with #9366.