Dev tools visibility fix

[tomasstrba]

Task/Issue URL: https://app.asana.com/0/1199178362774117/1201903875992992/f
Tech Design URL:
CC:

Description:
Fix of dev tools visibility after switching between tabs

Steps to test this PR:

1. Open the devtools.
2. Switch to a different tab
3. Switch back to the original tab.
4. Make sure dev tools are open and visible

Execute testing steps from #295

1. Open youtube.com full screen, exit full screen
2. Open one tab with youtube.com; open full screen, hit cmd+w
3. Open one New Tab, second tab with youtube.com; open full screen, hit cmd+w
4. Open one window with youtube tab and a New Tab, enter full screen; Open another window on external display with youtube.com, enter full screen, hit cmd+w in 2nd window, hit ctrl+Tab in 1st window

Testing checklist:

• Test on Big Sur or Catalina

---

Internal references:

Software Engineering Expectations
Technical Design Template
When ready for review, remember to post the PR in MM

[tomasstrba]

@mallexxx, please, are you planning to review this PR? I can find someone else if you are busy

[mallexxx]

@tomasstrba yes, doing it now

[mallexxx]

The rolled back change was meant to remove inspector view from webView's parent view when switching Tabs, otherwise there were some weird effects of multiple inspector stacking when many tabs have inspector open.
Instead I suggest adding the following code to WebView.swift, it will fix the issue:

  override func viewDidMoveToWindow() {
        super.viewDidMoveToWindow()
        if self.isInspectorShown {
            self.openDeveloperTools()
        }
    }

[tomasstrba]

@mallexxx got it! 👍 Thanks! Let me adjust the the solution

[tomasstrba]

Alex, thanks for the tip! 👍 This is ready for a re-review

[tomasstrba]

I also reorganized WebView.swift and added few marks. Hope it is ok

[mallexxx]

LGTM! (after fixing the // swiftlint:enable type_body_length linter issue)