Header popups budgeted their height against the IDE layered pane and anchored on the session panel's full bounds, so a session in a short tool window or an editor tab got balloons spanning the whole window. Placement now uses the session panel's visible rect for the height budget and the vertical clamp, mirroring SessionHoverCopyOverlay. The pane still decides only which side has horizontal room: clamping the width to the view rect would collapse the popup, since it deliberately sits beside the session.
kirillk
047c9893a2