[clang-format] Fix ColumnLimit violation while aligning (llvm#165627)

It did compute the length only on the first line, and thus the following
lines could be (and in the test example were) moved over the column
limit, when the = was aligned.

Author: HazardyKnusperkeks

clang/lib/Format/WhitespaceManager.cpp

@@ -591,7 +591,8 @@ static unsigned AlignTokens(const FormatStyle &Style, F &&Matches,
       CurrentChangeWidthRight = CurrentChange.TokenLength;
     const FormatToken *MatchingParenToEncounter = nullptr;
     for (unsigned J = I + 1;
-         J != E && (Changes[J].NewlinesBefore == 0 || MatchingParenToEncounter);
+         J != E && (Changes[J].NewlinesBefore == 0 ||
+                    MatchingParenToEncounter || Changes[J].IsAligned);
          ++J) {
       const auto &Change = Changes[J];
       const auto *Tok = Change.Tok;

clang/unittests/Format/FormatTest.cpp

@@ -20824,6 +20824,13 @@ TEST_F(FormatTest, AlignWithLineBreaks) {
                "    argument1,\n"
                "    argument2);",
                Style);
+
+  Style.ColumnLimit = 45;
+  verifyFormat("auto xxxxxxxx = foo;\n"
+               "auto x = whatever ? some / long -\n"
+               "                        computition / stuff\n"
+               "                  : random;",
+               Style);
 }
 
 TEST_F(FormatTest, AlignWithInitializerPeriods) {