Port following bugs: * Bug 905176 - Don't show the Check Spelling menu item for spellcheck=false contenteditable elements * Bug 908570 - Don't show the 'Add Dictionaries…' menu item for contenteditable elements with spellcheck=false * Bug 1071771 - disable dictionary list when it cannot be accessed from another process. This makes the context menu work again after using it on a misspelled word
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Port following bugs: * Bug 905176 - Don't show the Check Spelling menu item for spellcheck=false contenteditable elements * Bug 908570 - Don't show the 'Add Dictionaries…' menu item for contenteditable elements with spellcheck=false * Bug 1071771 - disable dictionary list when it cannot be accessed from another process. This makes the context menu work again after using it on a misspelled word * Bug 1026099 - Rework the spellchecker context menu to not use CPOWs