fix: improve some edge diffing cases

examples/__snapshots__/matchSnapshot_test.snap

@@ -72,3 +72,15 @@ map[string]interface {}{
 [TestMatchSnapshot/withConfig - 1]
 this should use the default config
 ---
+
+[TestMatchSnapshot/regression - 1]
+  dasda
+---
+
+[TestMatchSnapshot/regression - 2]
+---
+
+[TestMatchSnapshot/regression - 3]
+test and another test
+test another
+---

examples/matchSnapshot_test.go

@@ -64,6 +64,12 @@ func TestMatchSnapshot(t *testing.T) {
 		snaps.MatchSnapshot(t, "ignore regex patterns on names")
 	})
 
+	t.Run("regression", func(t *testing.T) {
+		snaps.MatchSnapshot(t, "")
+		snaps.MatchSnapshot(t, "")
+		snaps.MatchSnapshot(t, "")
+	})
+
 	t.Run("withConfig", func(t *testing.T) {
 		t.Run("should allow changing filename", func(t *testing.T) {
 			snaps.WithConfig(

snaps/diff.go

@@ -36,7 +36,8 @@ func isSingleline(s string) bool {
 // shouldPrintHighlights checks if the two strings are going to be presented with
 // inline highlights
 func shouldPrintHighlights(a, b string) bool {
-	return !colors.NOCOLOR && a != "\n" && b != "\n" && isSingleline(a) && isSingleline(b)
+	return !colors.NOCOLOR && a != "" && b != "" && isSingleline(a) && isSingleline(b)
+	// return !colors.NOCOLOR && a != "\n" && b != "\n" && isSingleline(a) && isSingleline(b)
 }
 
 // Compare two sequences of lines; generate the delta as a unified diff.
@@ -84,6 +85,9 @@ func getUnifiedDiff(a, b string) (string, int, int) {
 
 			if c.Tag == difflib.OpEqual {
 				for _, line := range aLines[i1:i2] {
+					if line == "\n" {
+						line = enterSymbol + "\n"
+					}
 					colors.FprintEqual(&s, line)
 				}
 

snaps/utils.go

@@ -30,6 +30,7 @@ const (
 	updateSymbol  = "✎ "
 	skipSymbol    = "⟳ "
 	enterSymbol   = "↳ "
+	newLineSymbol = "↵"
 
 	snapsExt    = ".snap"
 	endSequence = "---"