toolbar to give an idea of what it would look like
item was added to
toolbar at the position indicated by
NULL, highlighting is turned off. In that case
tool_item passed to this function must not be part of any widget
hierarchy. When an item is set as drop highlight item it can not
added to any widget hierarchy or used as highlight item for another toolbar.
Available since: 2.4
NULLto turn of highlighting.
The argument can be
The data is owned by the caller of the method.
A position on