Meson

fix(completion): correctly parse incomplete attrsets and provide completions #3298

Job	Run time
nix-build-develop-gcc (none, release, true)	2m 39s
nix-build-develop-clang (none, release, true)	2m 43s
nix-build-develop-gcc (none, release, false)	2m 49s
nix-build-develop-clang (none, release, false)	2m 39s
nix-build-develop-gcc (none, debug, true)	2m 36s
nix-build-develop-clang (none, debug, true)	2m 38s
nix-build-develop-gcc (none, debug, false)	2m 33s
nix-build-develop-clang (none, debug, false)	2m 36s
nix-build-develop-gcc (address, release, true)	4m 52s
nix-build-develop-gcc (address, release, false)	4m 48s
nix-build-develop-gcc (address, debug, true)	3m 53s
nix-build-develop-gcc (address, debug, false)	4m 8s
nix-build-develop-gcc (undefined, release, true)	3m 48s
nix-build-develop-gcc (undefined, release, false)	3m 58s
nix-build-develop-gcc (undefined, debug, true)	3m 0s
nix-build-develop-gcc (undefined, debug, false)	3m 5s
	52m 45s

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