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A forum post by TheBeardyMan

One of the things that you can do with a Timeline is to use it as a state machine. Each frame - or group of two or three frames if you want to avoid boundary conditions or make connections on otherwise densely packed gadgets easily visible - represents one state. Transitions to another state can be achieved by using "keep changes" Keyframes to animate the playhead position, and the Keyframes doing that can even be placed on the Timeline itself.

But if it turns out that you need more states than you originally thought, you have to expand the duration of the Timeline, and because values for the playhead tweak are relative to the duration of the Timeline, that causes the state change Keyframes to move the playhead to the wrong state. To fix that, your only option at present is to re-record every state change Keyframe.

It would be useful if the Timeline had a mode in which changing the width of the canvas doesn't change the frame to which any Keyframe animates its playhead. The canvas already has a group of Timeline specific window controls at the left of its title bar, so that might be a good place to put a new control to enable the new resizing mode.

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