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modify! form name mode #!optional textprocedure

Changes the textual DSL in FORM for the widget specified by NAME. MODE must be one of the following strings, with TEXT being an optional argument:

"delete"
Delete the widget (TEXT isn't required)
"replace"
Replace the widget with TEXT
"replace_inner"
Like "replace", but on the child lists
"insert"
Insert TEXT before the other children
"insert_inner"
Like "insert", but on a child list
"append"
Append TEXT after the other children
"append_inner"
Like "append", but on a child list
"before"
Insert TEXT before the widget
"before_inner"
Like "before", but on a child list
"after"
Append TEXT after the widget
"after_inner"
Like "after", but on a child list