Associate `PopupWindow`s with an ID for their active popup #18006

Job	Run time
python_test (ubuntu-22.04)	1m 42s
node_test (ubuntu-22.04)	3m 11s
python_test (macos-13)	1m 31s
node_test (macos-13)	4m 20s
python_test (windows-2022)	3m 19s
android	1m 45s
node_test (windows-2022)	7m 24s
build_and_test (ubuntu-22.04, 1.77)	10m 24s
build_and_test (macos-13, stable)	10m 28s
cpp_cmake (macos-13, 1.77)	4m 46s
cpp_test_driver (ubuntu-22.04)	6m 27s
build_and_test (windows-2022, stable)	8m 29s
cpp_cmake (windows-2022, nightly)	4m 43s
esp-idf-quick	8m 54s
cpp_test_driver (macos-13)	6m 43s
build_and_test (windows-2022, 1.77)	8m 58s
cpp_cmake (ubuntu-22.04, stable)	4m 39s
cpp_test_driver (windows-2022)	6m 28s
build_and_test (windows-2022, beta, --exclude ffmpeg --exclude gstreamer-player)	8m 30s
ffi_32bit_build	1m 11s
fmt_test	1m 42s
mcu (pico-st7789, thumbv6m-none-eabi)	41s
mcu_esp	2m 51s
mcu (stm32h735g, thumbv7em-none-eabihf)	35s
miri	45s
build_and_test (ubuntu-22.04, nightly)	10m 21s
updater_test (0.3.0)	1m 26s
vsce_build_test	6m 0s
docs / docs	7m 0s
format_lint_typecheck / format_lint_typecheck	54s
tree-sitter / tree-sitter-tests	13s
wasm / wasm	4m 25s
wasm_demo / wasm_demo	2m 38s
cpp_package_test	0s
wasm / build-slintpad	33s
	2h 33m 56s

Provide feedback