Version:           2.0.3
OS:                Linux

There are a couple of issues with dragging plots in layout mode:
- the rotated plots are not shown rotated
- if the mouse is well inside the plot being dragged, it is hard to move it to another tab as you don't clearly see when you are hovering over the destination tab

Reproducible: Always

Steps to Reproduce:
The problem with rotated plots is clear. 

For the other one:
- Load 3 curves with the data wizard
- Create a new, empty tab
- Go into layout mode
- Click on the middle of a plot and start dragging it to the new tab



Actual Results:  
You don't see clearly when the mouse is over the new tab, and most users won't even realize they can move the plot to another tab that way (already happened)

Expected Results:  
It would be better if either the plot background were forced to transparent so that you see where to put the mouse, or if we used only the outline of the plot being dragged and could see through it to target the new tab with the mouse easily.

OS: all