User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; ru; rv:18.104.22.168) Gecko/20101027 Fedora/3.6.12-1.fc14 Firefox/3.6.12
When Magnifier desktop effects is enabled, magnifier switched on by pressing hot-key (Meta-=) and mouse moved, there are many horizontal and vertical lines and bars displayed on the screen, making magnifier almost unusable.
Steps to Reproduce:
1. Run "System settings".
2. Select "Desktop effects" icon in "Workspace Appearance and Behaviour" section.
3. Select "All Effects" tab
4. In "Accessibility" section, set checkbox against Magnifier effect, and clear checkboxes against "Looking glass" and "Zoom" effects.
5. Press Meta-=, possibly multiple time.
6. Move mouse around.
Horizontal and vertical lines and bars appears on the screen, outside the magnifier area.
Screen shouldn't be damaged when magnifier moved around.
This effect observed when OpenGL compositing is enabled. I've observed it at desktop with intel driver (Intel i5 661 CPU-integrated graphics) and at notebook with NVidia GeForce GT 230M, using nvidia proprietary driver. I've tried to change OpenGL settings (OpenGL mode, Texture Filter, direct rendering) at desktop with integrated graphics, without success.
When compositing type switched to XRender, magnifier works much better although notably slower, nevertheless some "shadows" displayed from time to time. Also, in XRender mode, there is no black frame around the magnifier area.
Magnifier works well before upgrade to Fedora 14.
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