Fixed issue with selection frame line style.

The selection box/polygon drawn inherited  the line style set of the
most recent plot that was rendered. This resulted in cases where if the
plot had line-style set to NO_PEN, the selection box/polygon would not
show up at all. Fixed that.

Change-Id: Ib6948f9bd3f174583745e8185b576348e0ed549c
Merge topic 'fix_selection_frame_line_style' into master

45efae2a Fixed issue with selection frame line style.