Meson

fix(completion): correctly parse incomplete attrsets and provide completions #3299

Job	Run time
nix-build-develop-clang (none, release, true)	2m 43s
nix-build-develop-gcc (none, release, true)	2m 49s
nix-build-develop-clang (none, release, false)	2m 49s
nix-build-develop-gcc (none, release, false)	2m 45s
nix-build-develop-clang (none, debug, true)	2m 29s
nix-build-develop-gcc (none, debug, true)	2m 35s
nix-build-develop-clang (none, debug, false)	2m 42s
nix-build-develop-gcc (none, debug, false)	2m 32s
nix-build-develop-gcc (address, release, true)	4m 44s
nix-build-develop-gcc (address, release, false)	4m 50s
nix-build-develop-gcc (address, debug, true)	3m 58s
nix-build-develop-gcc (address, debug, false)	4m 5s
nix-build-develop-gcc (undefined, release, true)	3m 45s
nix-build-develop-gcc (undefined, release, false)	3m 54s
nix-build-develop-gcc (undefined, debug, true)	3m 4s
nix-build-develop-gcc (undefined, debug, false)	3m 4s
	52m 48s

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