Welcome screen does not accept dropped tabs

[jeremypw]

What Happened?

Attempted to move a tab to a secondary Code window with no open documents (and therefore no visible notebook) by dropping on the Welcome view. Instead a third window opened.

Dropping a text file from Files onto the Welcome view did create a new document in that window.

Steps to Reproduce

1. Open two Code windows one with open documents and one without.
2. Drag a tab into the empty window's Welcome view
3. Observe that a third window opens

Expected Behavior

Dropping a tab onto a Welcome view should behave the same as dropping a text file.

OS Version

6.x (Odin)

Software Version

Compiled from git

Log Output

No response

Hardware Info

No response

[jeremypw]

Not sure if this is easily fixable without modifying Granite.DynamicNotebook to make the underlying Gtk.Notebook more accessible.