public void gatherText(StringBuilder sb, int start, int end) {
		start = Math.max(0, Math.min(start, len));
		end = Math.max(0, Math.min(end, len));
		sb.append(chars, start, end - start);
	}
Append a portion of this line's text to the given string builder

@param sb the destination builder
@param start the first column, 0 up
@param end the last column, exclusive, 0 up
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/terminal/vt/VtLine.java