Two panels, one vertical and one horizontal, attached to the (e.g. left and top) edges of the screen, compete (overlap) for the corner of the screen. Making one of them shorter is difficult because the length property is scaled in percents rather than in pixels. It almost always leads to a gap between panels. Ideally, this should not be necessary, 100% could for example denote an available space, rather than the screen size. The panel with a lower number could be allowed to take the whole edge of the screen and panels added later would have to respect struts set by earlier panels.
Created attachment 4316 A patch against 4.9.1 In this patch horizontal panels stretch to the full screen width, and vertical panels occupy the remaining area (don't overlap horizontal panels).
Bug #8885 is a duplicate of this bug. It contains more information on this topic.
*** Bug 8885 has been marked as a duplicate of this bug. ***
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