Feature request #9757
allow for users to disable feature clipping to extend on a per layer basis
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Currently, when a given feature is partially visible on the map canvas, it seems a clip to extend is applied to the feature before it's rendered. While it makes a lot of sense performance-wise, it can be problematic with certain types of symbology.
For example, the centroid fill. If the feature is only partially shown on map canvas, the centroid fill point moves within the feature as it gets clipped to extend (see symbology-clip.png). If a user relied on this symbology style to decorate the "absolute" centroid of a given feature, the feature clipping process becomes problematic.
Not sure how (and even if) this deserves addressing, but as new interesting symbology styles are making way into QGIS, it's probably worth looking into this.
[FEATURE] Add option to symbology to prevent clipping of features
This option (located under the symbol advanced menu) disables the
automatic clipping of lines/polygons to the canvas extent. In
some cases this clipping results in unfavourable symbology (eg
centroid fills where the centroid must always be the actual
feature's centroid). (fix #9757)