patch 9.0.2049: Vim9: not recognizing qualified class vars for infix ops

Problem:  Vim9: not recognizing qualified class vars for infix ops
Solution: Drop the class type from the stack before generating the
          CLASSMEMBER instruction

closes: #13378
closes: #13379

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>
diff --git a/src/vim9expr.c b/src/vim9expr.c
index 85eb7af..41ed7e7 100644
--- a/src/vim9expr.c
+++ b/src/vim9expr.c
@@ -379,6 +379,8 @@
 	    }
 	    if (type->tt_type == VAR_CLASS)
 	    {
+		// Remove the class type from the stack
+		--cctx->ctx_type_stack.ga_len;
 		if (generate_CLASSMEMBER(cctx, TRUE, cl, m_idx) == FAIL)
 		    return FAIL;
 	    }
@@ -475,6 +477,8 @@
 	    }
 
 	    *arg = name_end;
+	    // Remove the class type from the stack
+	    --cctx->ctx_type_stack.ga_len;
 	    return generate_CLASSMEMBER(cctx, TRUE, cl, idx);
 	}