edInsertContent doesn't remember scrollTop property

[gmpfree]

in wp-includes/js/quicktags.js

original:

function edInsertContent(myField, myValue) {
	//IE support
	if (document.selection) {
		myField.focus();
		sel = document.selection.createRange();
		sel.text = myValue;
		myField.focus();
	}
	//MOZILLA/NETSCAPE support
	else if (myField.selectionStart || myField.selectionStart == '0') {
		var startPos = myField.selectionStart;
		var endPos = myField.selectionEnd;
		myField.value = myField.value.substring(0, startPos)
		              + myValue
                      + myField.value.substring(endPos, myField.value.length);
		myField.focus();
		myField.selectionStart = startPos + myValue.length;
		myField.selectionEnd = startPos + myValue.length;
	} else {
		myField.value += myValue;
		myField.focus();
	}
}

fixed:

function edInsertContent(myField, myValue) {
	//IE support
	if (document.selection) {
		myField.focus();
		sel = document.selection.createRange();
		sel.text = myValue;
		myField.focus();
	}
	//MOZILLA/NETSCAPE support
	else if (myField.selectionStart || myField.selectionStart == '0') {
		var startPos = myField.selectionStart;
		var endPos = myField.selectionEnd;
		'''var scrollTop = myField.scrollTop;'''
	
		myField.value = myField.value.substring(0, startPos)
		              + myValue
                      + myField.value.substring(endPos, myField.value.length);
		
		myField.focus();
		myField.selectionStart = startPos + myValue.length;
		myField.selectionEnd = startPos + myValue.length;
		'''myField.scrollTop = scrollTop;'''
	} else {
		myField.value += myValue;
		myField.focus();
	}
}

now insert image(via quicktag or upload manager) in plaintxt mode won't reset textarea scroll.

this bug has been around for a quite sometime, edInsertTag(handles link insertion) remember scrollTop but edInsertContent(handles image insertion) doesn't.

(In [10745]) Remember scrollTop in Quicktags, props gmpfree, fixes #9161