Created attachment 55997 [details]
screen shot of the working window and the resultant png

Version:           1.8.0 (using KDE 1.2) 
OS:                Linux

The font size in the legend box is different when exported to a png compared to what is displayed in the normal working window. This means the whole legend box becomes larger in the png and hence the layout of the plot looks different (eg. I size the legend box so it fits between data lines in the normal working view and then in the png it expands and covers up the data lines).

Work around is to set the font size much smaller than desired in the working window so that it is approximately correct in the export.

Reproducible: Always

Steps to Reproduce:
export a plot with a legend to png

Actual Results:  
legend box is larger than shown in the normal working view

Expected Results:  
identical png to what I see on my screen in the working window