Tear off last tab to window causes original windows last tab to be shown in white

[srirambv]

• Did you search for similar issues before submitting this one?
  Yes

• Describe the issue you encountered:
  Tear off last tab to window causes original windows last tab to be shown in white

• Platform (Win7, 8, 10? macOS? Linux distro?):
  Windows 10 x64

• Brave Version (revision SHA):
  Brave 0.17.6
  rev 30a3eee
  Muon 4.1.2

• Steps to reproduce:

  1. Clean install 0.17.6
  2. Open a bunch of tabs and load pages in them
  3. Tear off the last tab into a window, on first window the last tab is white, clicking on the tab shows the webview again

• Actual result:
  Tear off last tab to window causes original windows last tab to be shown in white

• Expected result:
  Should not show white blank page in original window

• Will the steps above reproduce in a fresh profile? If not what other info can be added?
  Yes

• Is this an issue in the currently released version?
  Not checked

• Can this issue be consistently reproduced?
  Yes

• Extra QA steps:
  1.
  2.
  3.

• Screenshot if needed:
  

• Any related issues:
  All Pages White, Maybe Crash? #4113 New windows are just white for a bit. #8128
  cc: @bridiver @bbondy

[saskakol]

I'd like to add that this also happens to me when closing a tab. The tab it automatically jumps to will be white. I can fix it by opening a new tab, going back to the white tab, and closing the new tab I just created.

[bsclifton]

Still an issue on 0.17.11 (thanks @srirambv for confirming)

[cndouglas]

+1 from me. Still a problem in 0.18.22 (d850e28).

[jonathansampson]

+1 Repros for me in 0.19.1 (2ee7a49)