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;
@@ -1032,7 +1034,7 @@
     // be considered bin packing unless the relevant AllowAll option is false or
     // this is a dict/object literal.
     bool PreviousIsBreakingCtorInitializerColon =
-        Previous.is(TT_CtorInitializerColon) &&
+        PreviousNonComment && PreviousNonComment->is(TT_CtorInitializerColon) &&
         Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon;
     if (!(Previous.isOneOf(tok::l_paren, tok::l_brace, TT_BinaryOperator) ||
           PreviousIsBreakingCtorInitializerColon) ||
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
@@ -7034,6 +7034,10 @@
       "SomeClass::Constructor() :\n"
       "    aaaaaaaaaaaaa(aaaaaaaaaaaaaa), aaaaaaaaaaaaaaa(aaaaaaaaaaaa) {}",
       Style);
+  verifyFormat(
+      "SomeClass::Constructor() : // NOLINT\n"
+      "    aaaaaaaaaaaaa(aaaaaaaaaaaaaa), aaaaaaaaaaaaaaa(aaaaaaaaaaaa) {}",
+      Style);
 
   Style.PackConstructorInitializers = FormatStyle::PCIS_BinPack;
   verifyFormat(
@@ -7101,6 +7105,10 @@
                "    aaaaaaaaaaaaa(aaaaaaaaaaaaaa),\n"
                "    aaaaaaaaaaaaa(aaaaaaaaaaaaaa) {}",
                OnePerLine);
+  verifyFormat("Foo::Foo(int i, int j) : // NOLINT\n"
+               "    i(i),                // comment\n"
+               "    j(j) {}",
+               OnePerLine);
   verifyFormat("MyClass::MyClass(int var) :\n"
                "    some_var_(var),            // 4 space indent\n"
                "    some_other_var_(var + 1) { // lined up\n"
@@ -7133,6 +7141,17 @@
                "    // Comment forcing unwanted break.\n"
                "    aaaa(aaaa) {}",
                Style);
+  verifyFormat("Constructor() : // NOLINT\n"
+               "    aaaa(aaaa) {}",
+               Style);
+  verifyFormat("Constructor() : // A very long trailing comment that cannot fit"
+               " on a single\n"
+               "                // line.\n"
+               "    aaaa(aaaa) {}",
+               "Constructor() : // A very long trailing comment that cannot fit"
+               " on a single line.\n"
+               "    aaaa(aaaa) {}",
+               Style);
 
   Style.ColumnLimit = 0;
   verifyFormat("SomeClass::Constructor() :\n"