Variable: mouse-drag-mode-line-buffer
mouse-drag-mode-line-buffer is a customizable variable defined in
mouse.el.gz.
Value
nil
Documentation
If non-nil, allow dragging files from the mode line.
When the buffer has an associated file, it can be dragged from the buffer name portion of its mode line to other programs.
This option is only supported on X, Haiku and Nextstep (GNUstep or macOS).
This variable was added, or its default value changed, in Emacs 29.1.
Probably introduced at or before Emacs version 29.1.
Source Code
;; Defined in /usr/src/emacs/lisp/mouse.el.gz
(defcustom mouse-drag-mode-line-buffer nil
"If non-nil, allow dragging files from the mode line.
When the buffer has an associated file, it can be dragged from
the buffer name portion of its mode line to other programs.
This option is only supported on X, Haiku and Nextstep (GNUstep
or macOS)."
:type 'boolean
:version "29.1")