[dashboard] When using the container widget with dock manager layout, the flow connection lines are offset

[dong-king]

Describe the bug when i use the container widget with dock manager layout, the widgets within this container have the flow connection line not connected correctly to the endpoints.

As shown in the figure below, if I change the left value or top values ​​of the static container, the connection line will be farther away from the button's endpoint.

Screenshots