On tab hover causes current tab history to disappear

[srirambv]

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

• Describe the issue you encountered:
  On tab hover causes current tab history to disappear

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

• Brave Version (revision SHA):
  Brave 0.15.3
  rev 1c04c53

• Steps to reproduce:

  1. Clean install 0.15.3 Preview 3
  2. Open a tab and visit a site and navigate few pages to generate history and back view
  3. Open a second tab and repeat the same to generate tab history and keep focus on the second tab
  4. Hover over the first tab from step 2 to generate tab preview
  5. Focus back to second tab, back/forward button gets disabled
  6. Click on first tab and switch back to second tab, back/forward button magically comes back and able to click and navigate back/forward tab history

• Actual result:
  On tab hover causes current tab history to disappear

• Expected result:
  On tab hover should not cause any change to current tab behavior

• 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?
  No

• Can this issue be consistently reproduced?
  Yes

• Extra QA steps:
  1.
  2.
  3.

• Screenshot if needed:

• Any related issues:
  cc: @bsclifton @NejcZdovc
  May be #8731

[luixxiul]

Also maybe: #8740 #8640

[NejcZdovc]

yeah this is a dup of #8640