Data labels cropped strangely in Orange 2.7.8 visualizations

In some of the visualization modules--I've tested parallel coordinate plots, Radviz, and survey plots--data labels on points or on the axes are being cropped oddly by the display window. For parallel coordinate plots and Radviz, this extends to those labels being cropped even in the report or saved pngs. On Radviz, the weird cropping behavior extends to data labels even when zoomed in.

I've attached images of the behavior. I'm running the Orange Snapshot bundle, build 2.7.8, under OS X Mavericks (10.9.5).

[Parallel Coordinate Plot of cars-mpg data](https://cloud.githubusercontent.com/assets/11898004/7100926/a5760068-dff1-11e4-8548-e287f1cea2ac.PNG) -- The y axis is mostly invisible, off to the left.
[Radviz of Breast Cancer Data](https://cloud.githubusercontent.com/assets/11898004/7100927/a5786a74-dff1-11e4-9c40-b62e45e43ebc.png) -- Two data labels are cropped by the edges of the plot area
[Zoomed Radviz](https://cloud.githubusercontent.com/assets/11898004/7100921/99fdd2f6-dff1-11e4-94d6-a3fc7725c2fc.png) -- The data label "displacement" continues to be cropped by the edge of the plot area, no matter how zoomed in
Edit, 4/12/15: The clipping problem with data labels on RadViz does not happen with continuous variables, provided a legend is attached to the plot. [Radviz of cars-mpg using a continuous variable](https://cloud.githubusercontent.com/assets/11898004/7111063/baad9052-e16f-11e4-9686-0981bdc32cb9.PNG) doesn't have the cropping problem.

Start by reproducing the cropping in the parallel coordinate plot, Radviz, and survey plot modules using the attached examples and the Orange Snapshot build described in the issue. Compare the on-screen, report, and saved PNG output; done means labels and axes remain fully visible, including when Radviz is zoomed.

Written by the indexing model from the issue text.