Ensure re-used fifo buffers makes that buffer the latest opened

src/buffer_manager.cc

@@ -149,4 +149,11 @@ void BufferManager::arrange_buffers(ConstArrayView<String> first_ones)
     m_buffers = std::move(res);
 }
 
+void BufferManager::make_latest(Buffer& buffer)
+{
+    auto it = find(m_buffers, &buffer);
+    kak_assert(it != m_buffers.end());
+    std::rotate(it, it+1, m_buffers.end());
+}
+
 }

src/buffer_manager.hh

@@ -31,6 +31,7 @@ public:
     Buffer* get_buffer_matching_ifp(const Regex& regex);
     Buffer& get_buffer_matching(const Regex& regex);
 
+    void make_latest(Buffer& buffer);
     void arrange_buffers(ConstArrayView<String> first_ones);
 
     Buffer& get_first_buffer();

src/buffer_utils.cc

@@ -176,6 +176,7 @@ Buffer* create_fifo_buffer(String name, int fd, Buffer::Flags flags, bool scroll
         buffer->flags() |= Buffer::Flags::NoUndo | flags;
         buffer->values().clear();
         buffer->reload({StringData::create("\n")}, ByteOrderMark::None, EolFormat::Lf, {InvalidTime, {}, {}});
+        buffer_manager.make_latest(*buffer);
     }
     else
         buffer = buffer_manager.create_buffer(