notebook: avoid crash on tab DND

Submitted by Andreas Henriksson `@andhe`

Description

See "gtk_notebook_detach_tab" API documentation. Using it instead of gtk_container_remove avoids an assertion crash in gtk+ when dragging and dropping a tab between terminal windows.

See also original bug report at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=825818

Version: 3.20.x

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notebook: avoid crash on tab DND

Submitted by Andreas Henriksson @andhe

Description

Submitted by Andreas Henriksson `@andhe`