Index: clang/lib/Format/UnwrappedLineParser.h
===================================================================
--- clang/lib/Format/UnwrappedLineParser.h
+++ clang/lib/Format/UnwrappedLineParser.h
@@ -92,7 +92,6 @@
   void reset();
   void parseFile();
   bool precededByCommentOrPPDirective() const;
-  bool mightFitOnOneLine() const;
   bool parseLevel(bool HasOpeningBrace, IfStmtKind *IfKind = nullptr);
   IfStmtKind parseBlock(bool MustBeDeclaration = false, unsigned AddLevels = 1u,
                         bool MunchSemi = true,
Index: clang/lib/Format/UnwrappedLineParser.cpp
===================================================================
--- clang/lib/Format/UnwrappedLineParser.cpp
+++ clang/lib/Format/UnwrappedLineParser.cpp
@@ -14,7 +14,6 @@
 
 #include "UnwrappedLineParser.h"
 #include "FormatToken.h"
-#include "TokenAnnotator.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
@@ -439,34 +438,8 @@
          (Previous->IsMultiline || Previous->NewlinesBefore > 0);
 }
 
-bool UnwrappedLineParser::mightFitOnOneLine() const {
-  const auto ColumnLimit = Style.ColumnLimit;
-  if (ColumnLimit == 0)
-    return true;
-
-  if (Lines.empty())
-    return true;
-
-  const auto &PreviousLine = Lines.back();
-  const auto &Tokens = PreviousLine.Tokens;
-  assert(!Tokens.empty());
-  const auto *LastToken = Tokens.back().Tok;
-  assert(LastToken);
-  if (!LastToken->isOneOf(tok::semi, tok::comment))
-    return true;
-
-  AnnotatedLine Line(PreviousLine);
-  assert(Line.Last == LastToken);
-
-  TokenAnnotator Annotator(Style, Keywords);
-  Annotator.annotate(Line);
-  Annotator.calculateFormattingInformation(Line);
-
-  return Line.Level * Style.IndentWidth + LastToken->TotalLength <= ColumnLimit;
-}
-
 // Returns true if a simple block, or false otherwise. (A simple block has a
-// single statement that fits on a single line.)
+// single statement.)
 bool UnwrappedLineParser::parseLevel(bool HasOpeningBrace, IfStmtKind *IfKind) {
   const bool IsPrecededByCommentOrPPDirective =
       !Style.RemoveBracesLLVM || precededByCommentOrPPDirective();
@@ -505,9 +478,7 @@
           return false;
         }
         const FormatToken *Next = Tokens->peekNextToken();
-        if (Next->is(tok::comment) && Next->NewlinesBefore == 0)
-          return false;
-        return mightFitOnOneLine();
+        return Next->isNot(tok::comment) || Next->NewlinesBefore > 0;
       }
       nextToken();
       addUnwrappedLine();
Index: clang/unittests/Format/FormatTest.cpp
===================================================================
--- clang/unittests/Format/FormatTest.cpp
+++ clang/unittests/Format/FormatTest.cpp
@@ -23965,6 +23965,19 @@
                "};",
                Style);
 
+  // FIXME: See https://github.com/llvm/llvm-project/issues/53543.
+#if 0
+  Style.ColumnLimit = 65;
+
+  verifyFormat("if (condition) {\n"
+               "  ff(Indices,\n"
+               "     [&](unsigned LHSI, unsigned RHSI) { return true; });\n"
+               "} else {\n"
+               "  ff(Indices,\n"
+               "     [&](unsigned LHSI, unsigned RHSI) { return true; });\n"
+               "}",
+               Style);
+
   Style.ColumnLimit = 20;
 
   verifyFormat("if (a) {\n"
@@ -23981,6 +23994,9 @@
                "  b = c >= 0 ? d : e;\n"
                "}",
                Style);
+#endif
+
+  Style.ColumnLimit = 20;
 
   verifyFormat("if (a)\n"
                "  b = c > 0 ? d : e;",