Called to indicate that the buffer operations between here and a
gtkTextBufferEndUserAction are part of a single
user-visible operation. The operations between
gtkTextBufferEndUserAction can then be grouped when creating
an undo stack.
GtkTextBuffer maintains a count of calls to
gtkTextBufferBeginUserAction that have not been closed with
a call to
gtkTextBufferEndUserAction, and emits the
"begin-user-action" and "end-user-action" signals only for the
outermost pair of calls. This allows you to build user actions
from other user actions.
The "interactive" buffer mutation functions, such as
gtkTextBufferInsertInteractive, automatically call begin/end
user action around the buffer operations they perform, so there's
no need to add extra calls if you user action consists solely of a
single call to one of those functions.
Derived by RGtkGen from GTK+ documentation
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