public void navigateFieldLeft(int field) {
			whichFocus = field;
			FieldState fs = fieldStates.get(field);
			fs.caret = fs.text.length();
		}
Change focus to the given field as if navigating left.

<p>
The caret will be moved to the rightmost position, because we're moving left from the
leftmost position of the field to the right.

@param field the field index to be given focus.
Ghidra/Framework/Docking/src/main/java/docking/widgets/textfield/TextFieldLinker.java