Corruption when moving overlapping layers with non-Normal blending mode

[Ulf Magnusson]

1. Create two rectangles in different layers.
2. Set 'Blend mode' to 'Multiply' (any non-Normal mode does it for me) for one of the layers.
3. Move it with the select tool while it overlaps the other layer.

Following those steps, I get corruption similar to the screenshot in 0.48. I'm not familiar with Inkscape internals, but I'm guessing the refresh (invalidation) region is calculated incorrectly. (Perhaps it only includes the rect and not the extra filter region.)

[Ulf Magnusson (ulfalizer)]

Adding the SVG file too. (Only screenshot displays the corruption out of the box though.)

[Ulf Magnusson (ulfalizer)]

Exact version is Inkscape 0.48.3.1 r9886, running on Ubuntu 12.04 LTS.

[su_v (suv-lp)]

Temporary artifacts only occur on objects with reduced opacity, where they temporarily have been overlapped by the filter effects region of the content of the layer which has the blend mode enabled (renders darker due to double-counting background).

Likely related: bug #168902, bug #180890

Reproduced with Inkscape 0.48.4 and 0.48+devel r12176 (cairo 1.12.2, cairo 1.12.14) on OS X 10.7.4

[Hachmann (marenhachmann)]

Just encountered this with Inkscape 0.91 on LM17.2.

[jazzynico (jazzynico)]

Also reproduced on Windows XP (32bit) with 0.46, 0.47 and trunk rev. 14274.

[Nathan Lee (nathan.lee)]

Hi - thanks for reporting this bug! I'm closing as part of migration to the new bugtracker on Gitlab. Issue is still being tracked at https://gitlab.com/inkscape/inkscape/-/issues/1264

Please feel free to file new bugs about the issues you're seeing at
http://inkscape.org/report.