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* Part of https://github.com/emilk/egui/issues/4238 When one side of a rectangle is all rounding we need to take care not to produce duplicated vertices in the rectangle path generator. The old code only handled three sides, but forgot the last side (the right side). The new code handles the right side, and also handles the other sides more robustly (with a floating point eps) and efficiently (in a single pass). The glitch was most notable in shadows with a high blur width. Examples of the glitch: <img width="203" alt="Screenshot 2024-03-26 at 20 15 38" src="https://github.com/emilk/egui/assets/1148717/dc1c0a06-35f0-4fda-a011-0e37d18454a0"> <img width="220" alt="Screenshot 2024-03-27 at 09 48 48" src="https://github.com/emilk/egui/assets/1148717/c278b28e-c3f9-4c82-ba20-0480621efd2f"> <img width="33" alt="Screenshot 2024-03-27 at 09 49 21" src="https://github.com/emilk/egui/assets/1148717/379ddf77-6590-4444-9c2e-67ab1e071f0f">