fix order list numbering (#988)

lib/src/widgets/style_widgets/number_point.dart

@@ -27,51 +27,40 @@ class QuillNumberPoint extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    var s = index.toString();
-    int? level = 0;
-    if (!attrs.containsKey(Attribute.indent.key) &&
-        !indentLevelCounts.containsKey(1)) {
-      indentLevelCounts.clear();
-      return Container(
-        alignment: AlignmentDirectional.topEnd,
-        width: width,
-        padding: EdgeInsetsDirectional.only(end: padding),
-        child: Text(withDot ? '$s.' : s, style: style),
-      );
-    }
-    if (attrs.containsKey(Attribute.indent.key)) {
-      level = attrs[Attribute.indent.key]!.value;
-    } else {
-      // first level but is back from previous indent level
-      // supposed to be "2."
-      indentLevelCounts[0] = 1;
-    }
-    if (indentLevelCounts.containsKey(level! + 1)) {
-      // last visited level is done, going up
-      indentLevelCounts.remove(level + 1);
-    }
-    final count = (indentLevelCounts[level] ?? 0) + 1;
-    indentLevelCounts[level] = count;
-
-    s = count.toString();
-    if (level % 3 == 1) {
-      // a. b. c. d. e. ...
-      s = _toExcelSheetColumnTitle(count);
-    } else if (level % 3 == 2) {
-      // i. ii. iii. ...
-      s = _intToRoman(count);
-    }
-    // level % 3 == 0 goes back to 1. 2. 3.
+    final olString = _getOlString();
 
     return Container(
       alignment: AlignmentDirectional.topEnd,
       width: width,
       padding: EdgeInsetsDirectional.only(end: padding),
-      child: Text(withDot ? '$s.' : s, style: style),
+      child: Text('$olString${withDot ? '.' : ''}', style: style),
     );
   }
 
-  String _toExcelSheetColumnTitle(int n) {
+  String _getOlString() {
+    final int indentLevel = attrs[Attribute.indent.key]?.value ?? 0;
+
+    if (indentLevelCounts.containsKey(indentLevel + 1)) {
+      // last visited level is done, going up
+      indentLevelCounts.remove(indentLevel + 1);
+    }
+
+    final count = (indentLevelCounts[indentLevel] ?? 0) + 1;
+    indentLevelCounts[indentLevel] = count;
+
+    final numberingMode = indentLevel % 3;
+    if (numberingMode == 1) {
+      // a. b. c.
+      return _intToAlpha(count);
+    } else if (numberingMode == 2) {
+      // i. ii. iii.
+      return _intToRoman(count);
+    }
+
+    return count.toString();
+  }
+
+  String _intToAlpha(int n) {
     final result = StringBuffer();
     while (n > 0) {
       n--;
@@ -93,14 +82,11 @@ class QuillNumberPoint extends StatelessWidget {
 
     final builder = StringBuffer();
     for (var a = 0; a < arabianRomanNumbers.length; a++) {
-      final times = (num / arabianRomanNumbers[a])
-          .truncate(); // equals 1 only when arabianRomanNumbers[a] = num
+      final times = (num / arabianRomanNumbers[a]).truncate(); // equals 1 only when arabianRomanNumbers[a] = num
       // executes n times where n is the number of times you have to add
       // the current roman number value to reach current num.
       builder.write(romanNumbers[a] * times);
-      num -= times *
-          arabianRomanNumbers[
-              a]; // subtract previous roman number value from num
+      num -= times * arabianRomanNumbers[a]; // subtract previous roman number value from num
     }
 
     return builder.toString().toLowerCase();