Index: clang/lib/Format/ContinuationIndenter.cpp
===================================================================
--- clang/lib/Format/ContinuationIndenter.cpp
+++ clang/lib/Format/ContinuationIndenter.cpp
@@ -404,6 +404,7 @@
       (State.Column + State.Line->Last->TotalLength - Previous.TotalLength >
            getColumnLimit(State) ||
        CurrentState.BreakBeforeParameter) &&
+      (!Current.isTrailingComment() || Current.NewlinesBefore > 0) &&
       (Style.AllowShortFunctionsOnASingleLine != FormatStyle::SFS_All ||
        Style.BreakConstructorInitializers != FormatStyle::BCIS_BeforeColon ||
        Style.ColumnLimit != 0)) {
@@ -793,6 +794,7 @@
               (Previous.is(tok::colon) && Previous.is(TT_ObjCMethodExpr)))) {
     CurrentState.LastSpace = State.Column;
   } else if (Previous.is(TT_CtorInitializerColon) &&
+             (!Current.isTrailingComment() || Current.NewlinesBefore > 0) &&
              Style.BreakConstructorInitializers ==
                  FormatStyle::BCIS_AfterColon) {
     CurrentState.Indent = State.Column;
Index: clang/lib/Format/TokenAnnotator.cpp
===================================================================
--- clang/lib/Format/TokenAnnotator.cpp
+++ clang/lib/Format/TokenAnnotator.cpp
@@ -4734,7 +4734,7 @@
     // the first list element. Otherwise, it should be placed outside of the
     // list.
     return Left.is(BK_BracedInit) ||
-           (Left.is(TT_CtorInitializerColon) &&
+           (Left.is(TT_CtorInitializerColon) && Right.NewlinesBefore > 0 &&
             Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon);
   }
   if (Left.is(tok::question) && Right.is(tok::colon))
@@ -4894,8 +4894,10 @@
   if (Right.is(tok::identifier) && Right.Next && Right.Next->is(TT_DictLiteral))
     return true;
 
-  if (Left.is(TT_CtorInitializerColon))
-    return Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon;
+  if (Left.is(TT_CtorInitializerColon)) {
+    return Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon &&
+           (!Right.isTrailingComment() || Right.NewlinesBefore > 0);
+  }
   if (Right.is(TT_CtorInitializerColon))
     return Style.BreakConstructorInitializers != FormatStyle::BCIS_AfterColon;
   if (Left.is(TT_CtorInitializerComma) &&
Index: clang/unittests/Format/FormatTest.cpp
===================================================================
--- clang/unittests/Format/FormatTest.cpp
+++ clang/unittests/Format/FormatTest.cpp
@@ -7096,7 +7096,7 @@
                "    aaaaaaaaaaaaa(aaaaaaaaaaaaaa),\n"
                "    aaaaaaaaaaaaa(aaaaaaaaaaaaaa) {}",
                OnePerLine);
-  verifyFormat("SomeClass::Constructor() :\n"
+  verifyFormat("SomeClass::Constructor() :         // NOLINT\n"
                "    aaaaaaaaaaaaa(aaaaaaaaaaaaaa), // Some comment\n"
                "    aaaaaaaaaaaaa(aaaaaaaaaaaaaa),\n"
                "    aaaaaaaaaaaaa(aaaaaaaaaaaaaa) {}",
@@ -7133,6 +7133,9 @@
                "    // Comment forcing unwanted break.\n"
                "    aaaa(aaaa) {}",
                Style);
+  verifyFormat("Constructor() : // NOLINT\n"
+               "    aaaa(aaaa) {}",
+               Style);
 
   Style.ColumnLimit = 0;
   verifyFormat("SomeClass::Constructor() :\n"