Changing feature values doesn't work when using Chrome devtools in a separate window

[CameronDowner]

Hi,

I'm using the devtools while using Chrome DevTools in a separate window pop out but the feature flag values aren't updating.

I think this is caused by the function sendMessage in controller.ts not being able to find the correct tab, as it's no longer the currentWindow - the DevTools window is.

I've cloned and tested the following solution, and I believe it works as expected. Let me know if you'd prefer me to open a pull request.

Current

function sendMessage(msg: Message) {
  chrome.tabs &&
    chrome.tabs.query(
      {
        active: true,
        currentWindow: true,
      },
      (tabs) => {
        chrome.tabs.sendMessage(tabs[0].id || 0, msg);
      }
    );
}

Suggestion

function sendMessage(msg: Message) {
    if (chrome.tabs && chrome.devtools?.inspectedWindow) {
        const  { tabId } = chrome.devtools.inspectedWindow;
        chrome.tabs.sendMessage(tabId || 0, msg);
    }
}

[bttf]

@CameronDowner Thank you for the detailed report. Your fix makes sense! This is related to another bug we've noticed which I'm writing an issue for now. If you'd like to submit a PR we certainly encourage it. Thanks!

[CameronDowner]

@bttf I've open PR #44 that should fix this issue