public static StringDiff allTextReplaced(String newText) {
		return new StringDiff(-1, -1, newText);
	}
Construct a new StringDiff with pos1 and pos2 are initialized to -1

@param newText string 
@return the new diff
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/code/StringDiff.java