Fix broken corner cases in DualThreadStack::grow_ifn

We only grow when the ring buffer is full, which allows for a nice
simplification of the code.

Tell grow_ifn if we pushed in current or next so that we can
distinguish between filled by next or filled by current when
m_current == m_next_begin

1 files changed, 5 insertions, 0 deletions

diff --git a/src/regex_impl.cc b/src/regex_impl.cc
index 09efdb75..23321af8 100644
--- a/src/regex_impl.cc
+++ b/src/regex_impl.cc
@@ -1579,6 +1579,11 @@ auto test_regex = UnitTest{[]{
     }
 
     {
+        TestVM<RegexMode::Forward | RegexMode::Search> vm{".{40}"};
+        kak_assert(vm.exec("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", RegexExecFlags::None));
+    }
+
+    {
         auto eq = [](const CompiledRegex::NamedCapture& lhs,
                      const CompiledRegex::NamedCapture& rhs) {
             return lhs.name == rhs.name and