setSelection constant
Set the text selection to the given range.
The provided argument is a Map<String, int> which includes the keys base
and extent indicating where the selection within the value of the
semantics node should start and where it should end. Values for both
keys can range from 0 to length of value (inclusive).
Setting base and extent to the same value will move the cursor to
that position (without selecting anything).
Implementation
static const SemanticsAction setSelection = SemanticsAction._(_kSetSelectionIndex)