Meson

fix(completion): correctly parse incomplete attrsets and provide completions #3301

Job	Run time
nix-build-develop-clang (none, release, true)	2m 35s
nix-build-develop-gcc (none, release, true)	2m 46s
nix-build-develop-clang (none, release, false)	2m 40s
nix-build-develop-gcc (none, release, false)	2m 46s
nix-build-develop-clang (none, debug, true)	2m 20s
nix-build-develop-gcc (none, debug, true)	2m 38s
nix-build-develop-clang (none, debug, false)	2m 27s
nix-build-develop-gcc (none, debug, false)	2m 40s
nix-build-develop-gcc (address, release, true)	4m 35s
nix-build-develop-gcc (address, release, false)	4m 47s
nix-build-develop-gcc (address, debug, true)	4m 6s
nix-build-develop-gcc (address, debug, false)	4m 6s
nix-build-develop-gcc (undefined, release, true)	3m 47s
nix-build-develop-gcc (undefined, release, false)	3m 52s
nix-build-develop-gcc (undefined, debug, true)	2m 55s
nix-build-develop-gcc (undefined, debug, false)	2m 56s
	51m 56s

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