PDF HTML: disable shaping on collapsed text runs #2675

Job	Run time
build-test-downstream (ubuntu-24.04, ubuntu-24.04-clang-18, ubuntu-24.04-clang-18)	16m 58s
build (macos-26, macos-26-armv8-clang-14, macos-26-armv8-clang-14)	15m 56s
build (macos-15, macos-15-armv8-clang-14, macos-15-armv8-clang-14)	13m 10s
build (windows-2022, windows-2022-msvc-1940, windows-2022-msvc-1940)	4m 46s
build (ubuntu-24.04, ubuntu-24.04-clang-18, ubuntu-24.04-clang-18)	17m 28s
build (ubuntu-24.04, ubuntu-24.04-clang-18, android-35-x86_64, 28.1.13356709)	16m 32s
build (ubuntu-24.04, ubuntu-24.04-gcc-14, ubuntu-24.04-gcc-14)	7m 14s
docker (ubuntu-24.04, ubuntu-24.04-clang-18)	34s
test (macos-26, macos-26-armv8-clang-14)	7m 36s
	1h 40m 14s

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