submit method
Implementation
void submit(QuillController controller) {
var index = controller.selection.start;
var length = controller.selection.end - index;
final linkValue = _getLinkAttributeValue(controller);
if (linkValue != null) {
// text should be the link's corresponding text, not selection
final leaf = controller.document.querySegmentLeafNode(index).leaf;
if (leaf != null) {
final range = getLinkRange(leaf);
index = range.start;
length = range.end - range.start;
}
}
controller
..replaceText(index, length, text, null)
..formatText(index, text.length, LinkAttribute(link));
}