This tag allows to set/get whether the texteditor object is
automatically set the Window.ActiveObject object of the
window in case the user performs a mouse action (click/select)
in the texteditor. As a consequence, the texteditor will then
get the full keyboard focus and will eventually signal its
active status by highlighting a marked area with the active
color rather than using the inactive marked color in inactive
state.
Please note that depending on the Texteditor.ReadOnly
setting, this attribute has different default values. In case
the texteditor is set to Texteditor.ReadOnly while initialized
this attribute will be set to False as a default. In contrast,
when the object is in full write mode it will be set to True
instead. However, during operation this behaviour can be overridden
by setting this attribute to another value.