Index: lib/Format/UnwrappedLineFormatter.cpp
===================================================================
--- lib/Format/UnwrappedLineFormatter.cpp
+++ lib/Format/UnwrappedLineFormatter.cpp
@@ -1092,7 +1092,7 @@
       // unless the current \c AnnotatedLine is not at the beginning of a line.
       bool StartsNewLine =
           TheLine.First->NewlinesBefore > 0 || TheLine.First->IsFirst;
-      if (StartsNewLine)
+      if (TheLine.Affected && StartsNewLine)
         IndentTracker.adjustToUnmodifiedLine(TheLine);
       if (!DryRun) {
         bool ReformatLeadingWhitespace =
Index: test/Format/line-ranges-indent.cpp
===================================================================
--- /dev/null
+++ test/Format/line-ranges-indent.cpp
@@ -0,0 +1,13 @@
+// RUN: grep -Ev "// *[A-Z-]+:" %s \
+// RUN:   | clang-format -style=LLVM -lines=3:3 \
+// RUN:   | FileCheck -strict-whitespace %s
+// CHECK: {{^\@protocol\ A$}}
+@protocol A
+// CHECK: {{^\ \@optional$}}
+ @optional
+// CHECK: {{^//\ comment$}}
+// comment
+// CHECK: {{^-\ \(void\)f;$}}
+- (void)f;
+// CHECK: {{^\@end$}}
+@end