I realized that no status tips were given to the open recent menu actions. Therefore a status tip was added for the Clear Recent List action in Designer. Sub-menu actions can not be given status tips (they can be assigned, but they don't show up when hovering over the sub-menu because the sub-menu is opened).
Status tips were also assigned to each of the open recent file actions added to the sub-menu with a string that simply says "Open" followed by the full path of the file name.
The code was also changed to use the QstringList::at() function to access the files in the file list member variable instead of using the [] operator. The reason is that the at() function is more efficient because the [] operator returns a modifiable reference to the item (an lvalue), where as the at() function just returns a reference (an rvalue).
[commit 858bbe1e28]
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