Resizing docked message log relative to right even if "flipped" left

[jojoknob]

This has been true for quite a while but I couldn’t find an issue about it. On stable, if docked message log is set to “Flip”, and the dock is on the left, dragging the resize arrow left will resize the pane right and vice versa. When docked message log is set to “Left” it moves in the expected direction. Incidentally, the resize arrows appear quite offset from the visual right edge of the pain when the pane is at its widest width. The arrows appear at almost twice the width of the pane.