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If press/release events for a mouse button come too fast, then using `IsMouseButtonReleased()` does not work. This has been noticed when using a touchpad on Linux when tapping with two fingers two emulate right mouse button click. The situation looks like this: ``` BeginDrawing <-- current==released, previous==released Pressed <-- current=pressed Released <-- current=released IsMouseButtonReleased <-- returns false because current==previous EndDrawing <-- previous=released ``` The fix is to update the previous mouse button state in addition to current mouse button state when `MouseButtonCallback()` is called by glfw. Now the situation is as follows: ``` BeginDrawing <-- current==released, previous==released Pressed <-- current=pressed, previous=released Released <-- current=released, previous=pressed IsMouseButtonReleased <-- returns true because current!=previous EndDrawing <-- previous=released ```