Fix removeFromRightSpace process at scanner (#529)

* fix removeFromRightSpace process at scanner

* remove unnecessary path

parser/parser_test.go

@@ -128,6 +128,11 @@ a: !tag
 a: !tag
   b: c
   d: e
+`,
+		`
+a:
+  b: c
+     
 `,
 	}
 	for _, src := range sources {

scanner/context.go

@@ -198,15 +198,14 @@ func (c *Context) addOriginBuf(r rune) {
 	}
 }
 
-func (c *Context) removeRightSpaceFromBuf() int {
+func (c *Context) removeRightSpaceFromBuf() {
 	trimmedBuf := c.obuf[:c.notSpaceOrgCharPos]
 	buflen := len(trimmedBuf)
 	diff := len(c.obuf) - buflen
 	if diff > 0 {
 		c.obuf = c.obuf[:buflen]
 		c.buf = c.bufferedSrc()
 	}
-	return diff
 }
 
 func (c *Context) isDocument() bool {

scanner/scanner.go

@@ -623,14 +623,7 @@ func (s *Scanner) scanNewLine(ctx *Context, c rune) {
 	// ---
 	// a:[space][space]
 	//   b: c
-	removedNum := ctx.removeRightSpaceFromBuf()
-	if removedNum > 0 {
-		s.column -= removedNum
-		s.offset -= removedNum
-		if s.savedPos != nil {
-			s.savedPos.Column -= removedNum
-		}
-	}
+	ctx.removeRightSpaceFromBuf()
 
 	// There is no problem that we ignore CR which followed by LF and normalize it to LF, because of following YAML1.2 spec.
 	// > Line breaks inside scalar content must be normalized by the YAML processor. Each such line break must be parsed into a single line feed character.