private void viewTopOfFile() {
		table.clear();
		model.clear();
		try {
			((FVTableModel) (table.getModel())).addRowsToBottom(reader.readNextChunk());
			viewportUtility.moveViewportToTop();
			table.restoreSelection();
		}
		catch (IOException e) {
			Msg.error(this, "Error reading first chunk of data", e);
		}
	}
Loads the first chunk and moves the viewport accordingly.
Ghidra/Framework/Project/src/main/java/ghidra/framework/main/logviewer/ui/FileViewer.java