libreoffice opens as vertical window instead of tab in some cases

[tbm]

I'm seeing some weird behaviour in sway when opening LibreOffice. Specifically, in some cases the LibreOffice opens a new window in vertical mode when I'm expecting a new tab.

For some reason I'm in V[T[...]] mode instead of just T[]. I don't even know how I managed that, but I managed to reproduce it with these steps:

• Open empty workspace
• mod-v
• open terminal
• open terminal
• in lower terminal: mod-b open terminal
• in upper terminal: mod-b open terminal mod-w
• in lower terminal: close both terminals

Now I have:

Workspace 6 (focused)
  Output: eDP-1
  Layout: splitv
  Representation: V[T[gnome-terminal-server gnome-terminal-server]]

When I open LibreOffice Writer without any arguments, it correctly opens as a new tab:

Representation: V[T[gnome-terminal-server gnome-terminal-server libreoffice-startcenter]]

I close LibreOffice.

Now I open LibreOffice and specify a file to open and suddenly LibreOffice opens as a new vertical window. I was expecting it as another tab.

Representation: V[T[gnome-terminal-server gnome-terminal-server] libreoffice-startcenter]

If I open other applications (e.g. evidence) (with or without arguments) they open correctly as tabs.

I see some other weird behaviour with LibreOffice and sway (I haven't opened issues yet) so maybe LibreOffice does something wrong. But I thought I'd report here.

This is with sway 1.2.

[tbm]

Case 1:

Case 2:

[tbm]

I still see this wrong behaviour with sway 1.4. Any help would be appreciated.

[tbm]

I still see this wrong behaviour with sway 1.5. This time with calibre. Any help would be appreciated.

[tbm]

For some reason I'm in V[T[...]] mode instead of just T[]. I don't even know how I managed that

Aha, I see a pattern here. This time I'm in H[T[...]] mode.

But again, since my terminal is in in the T[] scope, I would expect calibre to be opened in tabbed mode, not in horizontal mode. But I get:

Workspace 4 (focused)
  Output: eDP-1
  Layout: splith
  Representation: H[T[gnome-terminal-server gnome-terminal-server gnome-terminal-server gnome-terminal-server gnome-terminal-server gnome-terminal-server gnome-terminal-server] calibre]