Doc need: windows opened in multiple workspaces cause by false config

[iiey]

Step to reproduce:

1. Assign tabbed layout for certain programs then opening one in a workspace. Let say Firefox in Workspace 2

assign [class=Firefox*|Thunderbird] 2
for_window [class=Firefox*|Thunberbird] layout tabbed

#minimal config as in readme
bindsym $mod+1 workspace number 1
bindsym $mod+2 workspace number 2
bindsym $mod+Shift+1 move container to workspace number 1
bindsym $mod+Shift+2 move container to workspace number 2

2. Open new window for ex. Firefox History oder Firefox Bookmark or Thunderbird in Workspace 2
   Each time it will spawn new workspace for each window. That is bad, that I must use mouse to switch between them.
   

Expected behaviour is all windows should spawn in the same workspace.

I'm using ubuntu 16.04 KDE , i3 version 4.17.1 (also same problem in i3 version 4.11) with dual monitor.

[CastixGitHub]

It's actually an issue with your i3 config file and it is related to assign, not to the tabbed layout:
You need to replace: assign [class=Firefox*|Thunderbird] 2
with: assign [class=Firefox*|Thunderbird] number 2

from i3 user guide 4.17:

# Assign to the workspace with number 2, regardless of name
assign [class="^URxvt$"] → number 2

I think this issue should stay open until the readme is more clear about that

[iiey]

Wow, thank you so much! What an idiot I am, writing down without noticing it.
Then we let the maintainer close this issue when README, Wiki or FAQ are more clear about it.
Until then I would change the subject so other with same problem can find easier.