Pressing key TAB should switch inputs for CodeMirror elements in Automation Chain Editor

Currently, when pressing key TAB in Automation Chain Editor, a new character "\t" is inserted. See attachment tab-usage-automation-chain.webm. Pressing key TAB should switch input elements instead. Note that most of the time the key works, but whenever the input is made by CodeMirror, it doesn't (html inspection: div.CodeMirror-code). For example, "Document.SetProperty". In the video, I would like to have:

1. Cursor focus on input "XPath"
2. Press "TAB" key, switch to checkbox "save"
3. Press "TAB" key, switch to input "value"

It will make the development much faster and provide better user experience.