Created attachment 371902 [details]
GEGL Drop Shadow being cut off by layer's boundary

When applying an effect to a layer and the result of that effect is larger in size than the layer's boundary size, the effect is cut off by the layer's boundary size.

The same happens when using the brush tool: If your brush strokes go beyond the layer's boundary size, it is cut off by the layer's boundary size.

I suspect the same happens with all the drawing tools, but I've only tested the brush tool.

Effects [and tool] tested:
* GEGL Gaussian Blur;
* GEGL Drop Shadow;
* Brush tool.

Expected behaviour:
The layer's boundary size should automatically and dynamically be increased when effects and drawing tools(such as the brush tool) exceed that layer's boundary size.

This is particularly problematic with effects but even with drawing tools, if we want to restrict the brush strokes to a particular area, we usually make a selection first, so cutting the brush strokes off doesn't really seem to be desirable in any circumstances.

Software:
* GIMP 2.10 64-bit
* Windows 8 (Single Language Version)

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Seems to be a duplicate of the following two reports but I'm not sure about the first one because the exact issue isn't very clearly stated to me:
https://bugzilla.gnome.org/show_bug.cgi?id=93639
https://bugzilla.gnome.org/show_bug.cgi?id=710524

Not duplicate but related to this one:
https://bugzilla.gnome.org/show_bug.cgi?id=648267

I also wasn't sure if these reports were still being tracked, so I decided to report anyway, just in case.