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Problem: Vim9: popup_show() may return void
Solution: Modify popup_show() to return -1 for an invalid popup window
id (Yegappan Lakshmanan).
fixes: #18389
closes: #18401
Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>