I can tell you from my personal experience my wife had previously asked for and received two visitors visa's to Canada. We were talking about going again this summer for a few weeks to look at home in BC, assuming all would be easy with the RP application. When we went to the Embassy in Bangkok the woman we spoke to said the chances of her getting a Visitor's visa this time were somewhere between slim and none.
The whole process of getting the Visa's before involved us proving we had strong ties to Thailand, home, car, business, family etc and we would be returning for sure. But with a RP application in process they would not be inclined to risk letting her go. I realize that is not going to be the case for residents of every country but it is sure seems to be from Thailand.