Repro steps:
1. Select a frame in dopesheet and switch to the Curve view - the red marker has the same position as before in the Dopesheet, but the selection is lost in the Curve view
2. Select something in the Curve view, and switch to the Dopesheet - The red marker has the same position, but the frames selected are those that were selected in Dopesheet, before switching to the Curve View.

Expected behaviour: Both the red marker and the selected key frames should be properly highlighted, when switching between the 2 views.