"Not to want someone doing something." What shade of meaning is attached to using the gerund rather than infinitive?


On page 137 of First Certificate Trainer by Peter May (Cambridge Books for Cambridge Exams), the last paragraph in Test 4, Use of English Part 2 (a cloze test on a short text entitled Safe camping), reads:



After meals, pick up any bits of food that might be left on the ground, as these can attract insects – or larger creatures. It also makes sense, for the same reason to keep unused food in closed containers well away from the camp. You don't want a hungry bear or other animal suddenly appearing in your tent!



Why not the structure "(not) to want someone to do something"? Why not "You don't want a hungry bear or other animal to suddenly appear in your tent"? (Or "suddenly to appear in your tent", or "to appear in your tent suddenly"… it is not the place of the adverb I am interested in here.)


The structure "(not) to want someone doing something" is found in the Cambridge Dictionary online, with the example sentence "I don't want a load of traffic going past my house all night, waking me up." But no explanation is given as to when one structure should be used, and when the other.




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