SplitView has blue frame and sometimes missing table headers

[zdavatz]

2019-01-10 18:42:18.839 miele-lxiv[21831:3487396] <NSSplitView: 0x7ff8eed17490>: the delegate <BrowserController: 0x7ff8f09a8600> was sent -splitView:resizeSubviewsWithOldSize: and left the arranged view frames in an inconsistent state:
2019-01-10 18:42:18.839 miele-lxiv[21831:3487396] Split view bounds: {{0, 0}, {1441, 784}}
2019-01-10 18:42:18.839 miele-lxiv[21831:3487396]     Arranged view frame: {{0, 0}, {184, 784}}
2019-01-10 18:42:18.839 miele-lxiv[21831:3487396]     Arranged view frame: {{185, -21.5}, {1256, 784}}
2019-01-10 18:42:18.839 miele-lxiv[21831:3487396] The outer edges of the arranged view frames are supposed to line up with the split view's bounds' edges. NSSplitView is working around the problem, perhaps at the cost of more redrawing. (This message is only logged once per NSSplitView.)
2019-01-10 18:42:18.844 miele-lxiv[21831:3487396] <NSSplitView: 0x7ff8eefa1e90>: the delegate <BrowserController: 0x7ff8f09a8600> was sent -splitView:resizeSubviewsWithOldSize: and left the arranged view frames in an inconsistent state:
2019-01-10 18:42:18.844 miele-lxiv[21831:3487396] Split view bounds: {{0, 0}, {0, 0}}
2019-01-10 18:42:18.844 miele-lxiv[21831:3487396]     Arranged view frame: {{0, 0}, {-181, 0}}
2019-01-10 18:42:18.844 miele-lxiv[21831:3487396]     Arranged view frame: {{-180, 0}, {180, 0}}
2019-01-10 18:42:18.845 miele-lxiv[21831:3487396] The arranged view frames are not in the same order as the arranged views array. NSSplitView requires that these orders be kept consistent, otherwise behavior is undefined.