Fix '--color nth:regular' not to reset ANSI attributes of the original text

CHANGELOG.md

@@ -5,6 +5,7 @@ CHANGELOG
 ------
 - Fixed incorrect `$FZF_CLICK_HEADER_WORD` and `$FZF_CLICK_FOOTER_WORD` when the header or footer contains ANSI escape sequences and tab characters.
 - Fixed a bug where you cannot unset the default `--nth` using `change-nth` action.
+- Fixed a highlighting bug when using `--color fg:dim,nth:regular` pattern over ANSI-colored items.
 
 0.65.0
 ------

src/result.go

@@ -237,7 +237,7 @@ func (result *Result) colorOffsets(matchOffsets []Offset, nthOffsets []Offset, t
 					if color.Fg().IsDefault() && origColor.HasBg() {
 						color = origColor
 						if curr.nth {
-							color = color.WithAttr(attrNth)
+							color = color.WithAttr(attrNth &^ tui.AttrRegular)
 						}
 					} else {
 						color = origColor.MergeNonDefault(color)