Filter region of foreground is not refreshed when changing the visibility of the background layer for Blend filter
#### Steps to reproduce: - I got an SVG file which consists of the following layers (order is from top to bottom as seen in the below list) - 1 parent layer with 23 sublayers (all text) - 1 parent layer with 3 sublayers (2 layers with vector objects and 1 with multiple line paths made with the bezier curves and lines tool) - 4 layers each containing one PNG or JPEG of various sizes - 1 layer containing one square (fill and stroke of different colors) and some text (bold and regular) - 1 layer containing one square (no fill but colored stroke) #### What happened? Initially no problems with all layers. After expanding the number and complexity of layers for about two weeks, a couple of days ago, one of the layers containing a PNG (acting as a model for drawing on top by using separate layers with lines, shapes, text etc.) the "base PNG" layer didn't disappear when using the visibility/eye icon. When zooming in and out after changing that particular feature, the PNG became visible again. This goes as well for the other PNGs/JPEGs on the other layers. At times, they are even shown overlapping each other in visibility and opacity when being turned on and off. #### What should have happened? The layers should display without having to zoom when being set to visible/not visible and not be shown overlapping in visibility and opacity. #### Inkscape Version and Operating System: - Inkscape Version: 0.92.4 - Operating System: Windows 10 Home (updated with latest updates) - Operating System version: 64-bit <!-- Example file: Unfortunately no example file available as content professional/proprietary/client owned
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