Pinned tabs are opened in "New Window"

[jason-azze]

Did you search for similar issues before submitting this one?
yes

Describe the issue you encountered:
When opening a New Window, the new window includes all of my (many) pinned tabs. This is unexpected behavior.

Expected behavior:
New window should be "bare", without pinned tabs. The user's intention is probably to create a new window to be dragged somewhere. It's unlikely that the user wants a complete replica of the session from which the new window was spawned. Also, Chrome and Firefox spawn bare new windows. :-)

• Platform (Win7, 8, 10? macOS? Linux distro?):
  Ubuntu 16.04

• Brave Version:
  Brave 0.12.15
  Muon 1.4.31
  libchromiumcontent 53.0.2785.143
  V8 5.3.332.47
  Node.js 6.5.0
  Update Channel dev
  os.platform linux
  os.release 4.4.0-53-generic
  os.arch x64

• Steps to reproduce:

  1. Start with a session with one or more pinned tabs.
  2. Select "New Window" from the File menu.
  3. The new window opens along with all pinned tabs.

• Screenshot if needed:

• Any related issues:

[cndouglas]

Related: #5800 (Add pref to allow Pinned tabs to function in single-window mode)

[bsclifton]

Closing as a dupe of #5800

(preference is the solution, since this behavior is intended)