Revert "[clang-format] Fix AlignConsecutive on PP blocks"

This reverts commit b2eb439.

Caused the regression:
https://bugs.llvm.org/show_bug.cgi?id=47589

Reviewed By: MyDeveloperDay

Differential Revision: https://reviews.llvm.org/D89464

(cherry picked from commit b9e7894)

Author: sylvestre

clang/lib/Format/FormatToken.h

@@ -183,12 +183,6 @@ struct FormatToken {
   /// before the token.
   bool MustBreakBefore = false;
 
-  /// Whether to not align across this token
-  ///
-  /// This happens for example when a preprocessor directive ended directly
-  /// before the token, but very rarely otherwise.
-  bool MustBreakAlignBefore = false;
-
   /// The raw text of the token.
   ///
   /// Contains the raw token text without leading whitespace and without leading

clang/lib/Format/UnwrappedLineParser.cpp

@@ -3037,7 +3037,6 @@ void UnwrappedLineParser::readToken(int LevelDifference) {
       }
       FormatTok = Tokens->getNextToken();
       FormatTok->MustBreakBefore = true;
-      FormatTok->MustBreakAlignBefore = true;
     }
 
     if (!PPStack.empty() && (PPStack.back().Kind == PP_Unreachable) &&
@@ -3062,7 +3061,6 @@ void UnwrappedLineParser::pushToken(FormatToken *Tok) {
   Line->Tokens.push_back(UnwrappedLineNode(Tok));
   if (MustBreakBeforeNextToken) {
     Line->Tokens.back().Tok->MustBreakBefore = true;
-    Line->Tokens.back().Tok->MustBreakAlignBefore = true;
     MustBreakBeforeNextToken = false;
   }
 }

clang/lib/Format/WhitespaceManager.cpp

@@ -411,11 +411,9 @@ static unsigned AlignTokens(const FormatStyle &Style, F &&Matches,
     if (Changes[i].NewlinesBefore != 0) {
       CommasBeforeMatch = 0;
       EndOfSequence = i;
-      // If there is a blank line, there is a forced-align-break (eg,
-      // preprocessor), or if the last line didn't contain any matching token,
-      // the sequence ends here.
-      if (Changes[i].NewlinesBefore > 1 ||
-          Changes[i].Tok->MustBreakAlignBefore || !FoundMatchOnLine)
+      // If there is a blank line, or if the last line didn't contain any
+      // matching token, the sequence ends here.
+      if (Changes[i].NewlinesBefore > 1 || !FoundMatchOnLine)
         AlignCurrentSequence();
 
       FoundMatchOnLine = false;
@@ -726,8 +724,6 @@ void WhitespaceManager::alignTrailingComments() {
     if (Changes[i].StartOfBlockComment)
       continue;
     Newlines += Changes[i].NewlinesBefore;
-    if (Changes[i].Tok->MustBreakAlignBefore)
-      BreakBeforeNext = true;
     if (!Changes[i].IsTrailingComment)
       continue;
 

clang/unittests/Format/FormatTest.cpp

@@ -11968,29 +11968,6 @@ TEST_F(FormatTest, AlignConsecutiveAssignments) {
   verifyFormat("int oneTwoThree = 123; // comment\n"
                "int oneTwo      = 12;  // comment",
                Alignment);
-
-  // Bug 25167
-  verifyFormat("#if A\n"
-               "#else\n"
-               "int aaaaaaaa = 12;\n"
-               "#endif\n"
-               "#if B\n"
-               "#else\n"
-               "int a = 12;\n"
-               "#endif\n",
-               Alignment);
-  verifyFormat("enum foo {\n"
-               "#if A\n"
-               "#else\n"
-               "  aaaaaaaa = 12;\n"
-               "#endif\n"
-               "#if B\n"
-               "#else\n"
-               "  a = 12;\n"
-               "#endif\n"
-               "};\n",
-               Alignment);
-
   EXPECT_EQ("int a = 5;\n"
             "\n"
             "int oneTwoThree = 123;",

clang/unittests/Format/FormatTestComments.cpp

@@ -2780,27 +2780,6 @@ TEST_F(FormatTestComments, AlignTrailingComments) {
                    "       // line 2 about b\n"
                    "       long b;",
                    getLLVMStyleWithColumns(80)));
-
-  // Checks an edge case in preprocessor handling.
-  // These comments should *not* be aligned
-  EXPECT_EQ(
-      "#if FOO\n"
-      "#else\n"
-      "long a; // Line about a\n"
-      "#endif\n"
-      "#if BAR\n"
-      "#else\n"
-      "long b_long_name; // Line about b\n"
-      "#endif\n",
-      format("#if FOO\n"
-             "#else\n"
-             "long a;           // Line about a\n" // Previous (bad) behavior
-             "#endif\n"
-             "#if BAR\n"
-             "#else\n"
-             "long b_long_name; // Line about b\n"
-             "#endif\n",
-             getLLVMStyleWithColumns(80)));
 }
 
 TEST_F(FormatTestComments, AlignsBlockCommentDecorations) {