The ornamental design for a displaypanel with a transitional graphical user interface computer icon, as shown and described.
FIG. 1 is a front view of a display panel with a first image of a transitional graphical user interface computer icon showing our new design; and,
FIG. 2 is a front view thereof showing a second image.
The broken lines in both of the views are for illustrative purposes and do not form part of the claimed design.
The perimeters of the underlying display panel and the graphical user interface computer icon are understood to be flush.
The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1-2. No ornamental aspects are associated with the process or period in which one image transitions to the other image.