vim-patch:9.0.0198: ml_get error when switching buffer in Visual mode (#19756)

Problem:    ml_get error when switching buffer in Visual mode.
Solution:   End Visual mode when switching buffer. (closes vim/vim#10902)
cfeb8a584b

src/nvim/buffer.c

@@ -1533,6 +1533,15 @@ void set_curbuf(buf_T *buf, int action)
 /// be pointing to freed memory.
 void enter_buffer(buf_T *buf)
 {
+  // when closing the current buffer stop Visual mode
+  if (VIsual_active
+#if defined(EXITFREE)
+      && !entered_free_all_mem
+#endif
+      ) {
+    end_visual_mode();
+  }
+
   // Get the buffer in the current window.
   curwin->w_buffer = buf;
   curbuf = buf;