When an image with transparency is animated (e.g. with an Appear) the right and bottom lines of the box around the image will be transparent, cutting through, for instance, text that is below it. See example attach.
Note that this only happens with hardware acceleration enabled.
Steps to Reproduce:
Open the presentation attached.
1. Make sure you have hardware acceleration enabled.
2. Open attached presentation.
3. Enter presentation mode.
4. Click to trigger animation.
Bottom and right borders of the image are transparent wrt underlying text.
Frame should be correctly painted.
User Profile Reset: No
OpenGL enabled: Yes
Created attachment 144454 [details]
Created attachment 144455 [details]
screenshot with the problem
Bisected on Ubuntu 14.04 with 50max to https://cgit.freedesktop.org/libreoffice/core/commit/?id=94d935eecbba0161de2616c2234b4a5d9d3cad88
Resolves: fdo#87242 reuse vcl clip for cairo during animations
Adding Cc: to Caolán McNamara