Handle return in ordered lists context

This allows to continue an ordered list by pressing return, the same way
unordered lists and quote blocks are handled.

I changed the detection to use a regex that might ease other supports

ReText/editor.py

@@ -242,15 +242,25 @@ def handleReturn(self, cursor):
 		cursor.movePosition(QTextCursor.StartOfBlock, QTextCursor.KeepAnchor)
 		text = cursor.selectedText()
 		length = len(text)
-		pos = 0
-		while pos < length and (text[pos] in (' ', '\t')
-		  or text[pos:pos+2] in ('* ', '- ', '> ')):
-			pos += 1
-		if pos == length:
-			cursor.removeSelectedText()
-		# Reset the cursor
-		cursor = self.textCursor()
-		cursor.insertText(('\n' + text[:pos]) if pos < length else '\n')
+		match = re.search("^[\\s]*([*>-]|\\d+\\.) ", text)
+		if match is not None:
+			matchedText = match.group(0)
+			if len(matchedText) == length:
+				cursor.removeSelectedText()
+				matchedText = ''
+			else :
+				matchOL = re.match("^([\\s]*)(\\d+)\\. $", matchedText)
+				if matchOL is not None:
+					matchedPrefix = matchOL.group(1)
+					matchedNumber = int(matchOL.group(2))
+					matchedText = matchedPrefix + str(matchedNumber + 1) + ". "
+			# Reset the cursor
+			cursor = self.textCursor()
+			cursor.insertText('\n' + matchedText)
+		else :
+			# Reset the cursor
+			cursor = self.textCursor()
+			cursor.insertText('\n')
 		self.ensureCursorVisible()
 
 	def lineNumberAreaWidth(self):