PDF tiling patterns: colour-through-base fix, BBox clip, registry ded… #2750

Job	Run time
build-test-downstream (ubuntu-24.04, ubuntu-24.04-clang-18, ubuntu-24.04-clang-18)	14m 45s
build (macos-15, macos-15-armv8-clang-14, macos-15-armv8-clang-14)	13m 49s
build (ubuntu-24.04, ubuntu-24.04-gcc-14, ubuntu-24.04-gcc-14)	8m 3s
build (ubuntu-24.04, ubuntu-24.04-clang-18, android-35-x86_64, 28.1.13356709)	15m 29s
build (macos-26, macos-26-armv8-clang-14, macos-26-armv8-clang-14)	18m 26s
build (windows-2022, windows-2022-msvc-1940, windows-2022-msvc-1940)	4m 6s
build (ubuntu-24.04, ubuntu-24.04-clang-18, ubuntu-24.04-clang-18)	16m 24s
docker (ubuntu-24.04, ubuntu-24.04-clang-18)	28s
test (macos-26, macos-26-armv8-clang-14)	9m 56s
	1h 41m 26s

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