Associate `PopupWindow`s with an ID for their active popup #18008

Job	Run time
python_test (ubuntu-22.04)	1m 36s
node_test (ubuntu-22.04)	3m 10s
python_test (macos-13)	2m 5s
build_and_test (ubuntu-22.04, 1.77)	10m 24s
cpp_test_driver (ubuntu-22.04)	6m 48s
node_test (macos-13)	3m 17s
python_test (windows-2022)	3m 5s
build_and_test (macos-13, stable)	10m 41s
node_test (windows-2022)	4m 50s
cpp_test_driver (macos-13)	7m 10s
build_and_test (windows-2022, stable)	10m 33s
cpp_test_driver (windows-2022)	6m 48s
build_and_test (windows-2022, 1.77)	10m 19s
vsce_build_test	5m 46s
build_and_test (windows-2022, beta, --exclude ffmpeg --exclude gstreamer-player)	10m 31s
cpp_cmake (macos-13, 1.77)	23m 33s
build_and_test (ubuntu-22.04, nightly)	10m 40s
ffi_32bit_build	1m 30s
mcu (pico-st7789, thumbv6m-none-eabi)	44s
mcu_esp	2m 51s
mcu (stm32h735g, thumbv7em-none-eabihf)	42s
cpp_cmake (windows-2022, nightly)	9m 23s
android	1m 53s
esp-idf-quick	9m 20s
fmt_test	1m 28s
cpp_cmake (ubuntu-22.04, stable)	6m 55s
miri	43s
updater_test (0.3.0)	1m 42s
docs / docs	7m 14s
format_lint_typecheck / format_lint_typecheck	1m 3s
tree-sitter / tree-sitter-tests	13s
wasm / wasm	4m 29s
wasm_demo / wasm_demo	2m 39s
wasm / build-slintpad	31s
cpp_package_test	2m 10s
	3h 6m 46s

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