Fix indentation-detection at indent level 0.

This correctly formats:
  {
    a;
  }
where { is incorrectly indented by 2, but is at level 0, when
reformatting only 'a;'.

llvm-svn: 174737

clang/lib/Format/Format.cpp

@@ -977,10 +977,10 @@ private:
   /// that level is unknown.
   unsigned GetIndent(const std::vector<int> IndentForLevel,
                      unsigned Level) {
-    if (Level == 0)
-      return 0;
     if (IndentForLevel[Level] != -1)
       return IndentForLevel[Level];
+    if (Level == 0)
+      return 0;
     return GetIndent(IndentForLevel, Level - 1) + 2;
   }
 

clang/unittests/Format/FormatTest.cpp

@@ -2593,7 +2593,12 @@ TEST_F(FormatTest, ReformatRegionAdjustsIndent) {
                         "           b;\n"
                         "}\n"
                         "}", 22, 2, getLLVMStyle()));
-} 
+  EXPECT_EQ("  {\n"
+            "    a;\n"
+            "  }", format("  {\n"
+                          "a;\n"
+                          "  }", 4, 2, getLLVMStyle()));
+}
 
 } // end namespace tooling
 } // end namespace clang