Modernize benchmarks

See https://go.dev/blog/testing-b-loop

Author: stefanhaller

pkg/config/app_config_test.go

@@ -691,7 +691,7 @@ keybinding:
 `)
 
 func BenchmarkMigrationOnLargeConfiguration(b *testing.B) {
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
 		_, _ = computeMigratedConfig("path doesn't matter", largeConfiguration)
 	}
 }

pkg/gui/presentation/graph/graph_test.go

@@ -548,7 +548,7 @@ func BenchmarkRenderCommitGraph(b *testing.B) {
 		return authors.AuthorStyle(commit.AuthorName)
 	}
 	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
 		RenderCommitGraph(commits, "selected", getStyle)
 	}
 }

pkg/utils/formatting_test.go

@@ -253,25 +253,25 @@ func TestRenderDisplayStrings(t *testing.T) {
 }
 
 func BenchmarkStringWidthAsciiOriginal(b *testing.B) {
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
 		runewidth.StringWidth("some ASCII string")
 	}
 }
 
 func BenchmarkStringWidthAsciiOptimized(b *testing.B) {
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
 		StringWidth("some ASCII string")
 	}
 }
 
 func BenchmarkStringWidthNonAsciiOriginal(b *testing.B) {
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
 		runewidth.StringWidth("some non-ASCII string 🍉")
 	}
 }
 
 func BenchmarkStringWidthNonAsciiOptimized(b *testing.B) {
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
 		StringWidth("some non-ASCII string 🍉")
 	}
 }