event/multiqueue.c: Rename "queue" to "multiqueue".

`lib/queue.h` implements a basic queue. `event/queue.c` implements
a specialized data structure on top of lib/queue.h; it is not a "normal"
queue.

Rename the specialized multi-level queue implemented in event/queue.c to
"multiqueue", to avoid confusion when reading the code.

Before this change one can eventually notice that "macros (uppercase
symbols) are for the normal queue, lowercase operations are for the
multi-level queue", but that is unnecessary friction for new developers
(or existing developers just visiting this part of the codebase).

1 files changed, 16 insertions, 0 deletions

diff --git a/test/unit/fixtures/multiqueue.c b/test/unit/fixtures/multiqueue.c
new file mode 100644
index 0000000000..da63e55919
--- /dev/null
+++ b/test/unit/fixtures/multiqueue.c
@@ -0,0 +1,16 @@
+#include <string.h>
+#include <stdlib.h>
+#include "nvim/event/multiqueue.h"
+#include "multiqueue.h"
+
+
+void ut_multiqueue_put(MultiQueue *this, const char *str)
+{
+  multiqueue_put(this, NULL, 1, str);
+}
+
+const char *ut_multiqueue_get(MultiQueue *this)
+{
+  Event event = multiqueue_get(this);
+  return event.argv[0];
+}