Test whether a key was newly pressed or generated a repeat event this frame.
key
ImGuiKey logical key identifier, not a platform-native key code.
True if the key was pressed this frame, including held-key repeats when enabled; false otherwise.
was key pressed (went from !Down to Down)?
if repeat=true, uses io.KeyRepeatDelay / KeyRepeatRate
Implied repeat = true
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Test whether a key was newly pressed or generated a repeat event this frame.