Grid: only stretch auto tracks if content-alignment is stretch (#783) #2489

Job	Run time
Build Benchmarks	36s
Build Examples	43s
Build Benchmarks (w/ yoga)	49s
Build [debug feature]	15s
MSRV Build [Rust 1.65]	1m 24s
Clippy	39s
Documentation	21s
Test Fixture Formatting	10s
Rustfmt	20s
Markdown Lint	4s
Test Suite [alloc + all algorithms]	1m 4s
Test Suite [std + block)]	1m 7s
Test Suite [default features]	1m 3s
Test Suite [default except content_size]	1m 2s
Test Suite [default + serde]	1m 8s
Test Suite [std + flexbox]	1m 2s
Test Suite [std + flexbox + detailed_layout_info]	1m 3s
Test Suite [std + grid]	1m 0s
Test Suite [std + grid + detailed_layout_info]	1m 14s
Test Suite [alloc + no algorithms]	1m 3s
Test Suite [std (no algorithms)]	1m 3s
Test Suite [no features]	1m 9s
	18m 19s

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