The peek handlers sat on the rail's layout slot, which is 80px wide while the
card it holds is only 56px — so the card's own margin was a live hover zone with
nothing visible in it. Leaving the filter tab or panel to the left put the
cursor straight into it and the rail popped open unprompted; the gap between the
two hover zones was literally 0px. Moving the handlers onto the card leaves a
16px no man's land (x=69..85) where neither opens.
peter
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