[clang-format] Introduce the flag which allows not to shrink lines

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* https://reviews.llvm.org/D53072
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Currently there's no way to prevent to lines optimization even
if you have intentionally put <CR> to split the line.

In general case it's fine. So I would prefer to have such option
which you can enable in special cases (for me it's an IDE related use case).

Revert this change if upstream clang-format offers better solution.

This is a cherry pick from commits b748c82e3664c2e2e3d29645ede472d87b8cde63
and 1817513d4f3a2e4e26be124dbe395340f798fd51.

Change-Id: I9d2935b937bb68ea8dc59fac8463718475e9c080
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index c05fceb476..38906d9ee3 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -385,6 +385,22 @@ TEST_F(FormatTest, RemovesEmptyLines) {
                    "  void funk() {}\n"
                    "};",
                    Style));
+
+  Style.KeepLineBreaksForNonEmptyLines = true;
+  Style.ColumnLimit = 0;
+  EXPECT_EQ("int foo(int a,\n"
+            "        int b)\n"
+            "{\n"
+            "}",
+            format("int foo(int a,\n"
+                   "int b) {}",
+                   Style));
+
+  EXPECT_EQ("[]() {\n"
+            "  foo(); }",
+            format("[]() {\n"
+                   "foo(); }",
+                   Style));
 }
 
 TEST_F(FormatTest, RecognizesBinaryOperatorKeywords) {