The Other Properties menu lets you add or remove three other useful text
properties: read-only, invisible and intangible.
The intangible property disallows moving point within the text,
the invisible text property hides text from display, and the
read-only property disallows alteration of the text.
Each of these special properties has a menu item to add it to the region. The last menu item, `Remove Special', removes all of these special properties from the text in the region.
Currently, the invisible and intangible properties are
not saved in the text/enriched format. The read-only
property is saved, but it is not a standard part of the text/enriched
format, so other editors may not respect it.
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