Implementation note: Because find-presentation-translators is called during pointer
sensitivity computations (that is, whenever the user mouses the pointer around in any CLIM
pane), it should cache its result in order to avoid consing. Therefore, the resulting list of
translators should not be modified; the consequences of doing so are unspecified.

=> test-presentation-translator translator presentation context-type frame window x y &key
event modifier-state for-menu [Function]
Returns true if the translator translator applies to the presentation presentation in input context
type context-type, otherwise returns false. (There is no from-type argument because it is derived
from presentation.) x and y are the x and y positions of the pointer within the window stream
window.

event and modifier-state are a pointer button event and modifier state (see event-modifier-
key-state), and are compared against the translator's gesture. event defaults to nil, and
modifier-state defaults to 0, meaning that no modifier keys are held down. Only one of event or
modifier-state may be supplied; it is unspecified what will happen if both are supplied.

If for-menu is true, the comparison against event and modifier-state is not done.

presentation, context-type, frame, window, x, y, and event are passed along to the translator's
tester if and when the tester is called.