Reduce SSR Buffers in VList

[futursolo]

Description

This pull request updates the VList rendering logic that a new buffer is created only when a child VNode does not resolve immediately.

Checklist

• I have reviewed my own code
• I have added tests

[github-actions]

Visit the preview URL for this PR (updated for commit c9de0a0):

https://yew-rs-api--pr2826-reduced-buffers-dpb963n6.web.app

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[github-actions]

Benchmark - SSR

Yew Master

Benchmark	Round	Min (ms)	Max (ms)	Mean (ms)	Standard Deviation
Baseline	10	414.035	420.608	415.211	1.986
Hello World	10	1321.769	1340.888	1328.334	5.512
Function Router	10	3933.803	3961.567	3946.938	8.579
Concurrent Task	10	1011.628	1013.520	1012.600	0.696

Pull Request

Benchmark	Round	Min (ms)	Max (ms)	Mean (ms)	Standard Deviation
Baseline	10	409.141	474.372	426.398	19.300
Hello World	10	1315.391	1364.253	1333.935	15.156
Function Router	10	3053.501	3086.041	3065.595	8.840
Concurrent Task	10	1011.311	1013.019	1012.290	0.544

[github-actions]

Size Comparison

examples	master (KB)	pull request (KB)	diff (KB)	diff (%)
boids	168.569	168.563	-0.006	-0.003%
contexts	106.698	106.701	+0.003	+0.003%
counter	84.322	84.322	0	0.000%
counter_functional	84.965	84.962	-0.003	-0.003%
dyn_create_destroy_apps	87.277	87.276	-0.001	-0.001%
file_upload	100.852	100.852	0	0.000%
function_memory_game	162.231	162.224	-0.008	-0.005%
function_router	343.247	343.233	-0.014	-0.004%
function_todomvc	157.198	157.193	-0.005	-0.003%
futures	221.177	221.178	+0.001	+0.000%
game_of_life	104.509	104.510	+0.001	+0.001%
immutable	180.214	180.221	+0.007	+0.004%
inner_html	81.438	81.437	-0.002	-0.002%
js_callback	110.025	110.025	0	0.000%
keyed_list	192.827	192.824	-0.003	-0.002%
mount_point	84.124	84.123	-0.001	-0.001%
nested_list	111.504	111.507	+0.003	+0.003%
node_refs	91.229	91.232	+0.003	+0.003%
password_strength	1547.431	1547.432	+0.001	+0.000%
portals	94.747	94.745	-0.002	-0.002%
router	312.695	312.693	-0.002	-0.001%
simple_ssr	150.671	150.674	+0.003	+0.002%
ssr_router	388.759	388.740	-0.019	-0.005%
suspense	107.726	107.728	+0.002	+0.002%
timer	87.071	87.070	-0.001	-0.001%
todomvc	138.570	138.570	0	0.000%
two_apps	84.983	84.982	-0.001	-0.001%
web_worker_fib	149.966	149.951	-0.015	-0.010%
webgl	85.115	85.117	+0.002	+0.002%

✅ None of the examples has changed their size significantly.

[hamza1311]

Looks good 🎉

[hamza1311]

Out of curiosity, what happens this isn't boxed? If the issue is stack overflow, is this something tail recursion can fix?

[futursolo]

With Rust’s async/await design, it’s not possible to recursively call async functions without boxing.

https://rust-lang.github.io/async-book/07_workarounds/04_recursion.html