Function call in class: and style: directives are inconsistent with standard attributes

[adiguba]

Describe the bug

Function call in class: and style: directives are inconsistent with standard attributes.

color={func()} will be re-trigerred only if a reactive state is updated.
style:color={func()} will also be re-trigerred when any of the other style: directive is updated

Reproduction

In this example we use an function to generate a random color, ans a state to change the size of the text (using the obsolete<font> only in order to have a visual result).
Updating the size of the text do no re-trigger the function :
https://svelte.dev/playground/hello-world?version=5.56.4#H4sIAAAAAAAACm2QQW_bMAyF_wrHDbC82U67dRngOQGGAcMuPfU476DYjCNApQyJTrsZ_u-D7BQLCuskfHwkH9-IrB8JS_xJ1jp4ct62oKg1Qm2KGR6NpYDlrxHlTx91EWD20vWt74twJiuRHXSgNd44FmIJWGIVGm962ddccy3HgRsxjqEjJq-FvjvrvEphjNVaGsdBoIkQdpC8TeADqHstp8Jrbt2jSuE93Dz_mF9aiHsQb7hTt9u06HX7INqLSm6SDLZpEaxpSOXb9Ov_4c5SYV2nanzloMZs2fui9iSD54XNaFpOsCQQzF-CHbwLooVUcpdcmrjaXJ0bVSVUgSw1AgfDbXnWdqDdGCtT1Ejl-pjH_rbaXH7X9OMq_bRK71bp51W6XaVfrmi1WWzPh1StOS_KN3kOQzDcgYbq6Fj2IA4CEciJoDlp7gjyfBHH-pLfbnyV9jRHeB1ELYFE4uTLfBFvDoNQmGdt5mXR1-IFMxR6FizFDzT9zlC0sU-GWyyP2gaa_gGZOj6-5wIAAA

In this exemple, we do the same thing using style: directive, and updating and changing the size restarts the generateColor() function :
https://svelte.dev/playground/hello-world?version=5.56.4#H4sIAAAAAAAACnWQQY_TMBCF_8poQIqzZNMWlh5CWgkhIS6c9kg4eONpseSOI3uS3SXKf0dOu6KsiA-W_L33bL8ZkfWJsMJv5JyHRx-cAUXGCpkcCzxYRxGrHyPKc5d8CWDxkvrcdWUcyEliDzrS_3jrWYglYoV1bIPtZN9ww40cem7FeoYjMQUt9MU7H1QOY1IbaT1HgTZB2EH2JoN3oL5r-VUGzcafVA43sH76Oq-8FH8vwfJRbbZ52WlzLzqIytZZAdu8jM62pG63-ae_l3tHpfNH1eCrHzRYnN99cQeSPvCZzWg6V3AkEO1vgh28jaKFVLahU3aJcb26Kpx8FdSRHLUCD5ZNNWjX025MypQ8UvsuTWS_Lj_SqV5dTtfKZokvJt4v8cXEhwV-9w-vV-cqc7na2AGiPDuq5iHtxlcjnS7qwbPcpsLXtRuJJGL5CH1M-2wFYwO1YgdKbxk77BvGAoWeBCsJPU0_CxRt3aNlg9VBu0jTH1Mj-xDRAgAA

It's event worse with async function, since this can lead to an await_reactivity_loss :

https://svelte.dev/playground/hello-world?version=5.56.4#H4sIAAAAAAAACnWRQW_bMAyF_wqhDbDcuU7SdTl4ToBhQLHLTj3OPagSkwlQKEOinaaG__sgJ8WyYtZBgD6-J-pRgyB1QFGJH-ich6MPzoBEYxlNLgqxsw6jqH4Ngk9t0iUgijfXt7YtY4-OE3tWEf_HtSdG4igqUUcdbMvbhhpqWMUTadh1pNl6gj0SBsX43TsfZA5D0jSsPUUGnSBsIPuQwSeQPxX_LoMi4w8yhxtYvjxMKy_ZP3KwtJerdV62yjyyCiyzZVbAOi-jsxrl7Tr_-vdy77B0fi8b8e4FjSjOfd_UAbkLdGYTGs9BHDJE-4qwgY-RFaPMVnjILjaqF1exk66COqJDzfBsyVS9ch1uhlQZk4Zr36aJbJflFzzUi8vpurKa47OOuzk-6_g8w-__4fXiHGUKVxvbQ-STw2oa0mZQR2X5_deOF83OE9-m2NfhG47IbGkPXUz7JAVjA2q2PaaOxvbbhkQhGF9YVBw6HJ8Kwcq6oyUjqp1yEcc_DOdqbd0CAAA

We can see that the same problem can occurs on the class: directives :

https://svelte.dev/playground/hello-world?version=5.56.4#H4sIAAAAAAAACm1QQY7bMAz8CkH04ACpswXai-oE2FsvfUFdFJLFaIlVKEOis7sN_PdCttPuoRcBGs4Mh3NDsRdCg98oxgQvKUcPDXlW8jvc45kjFTQ_bqhvY-VVAPd31eM4tuVKUSvmbKH_4UMSJdGCBrsyZB711EsvvZ4nGZSTAJdfmXyzg1uFex2SlBSpjSk0Pd6nPe6-rvNMOmWB71af2mzFp0uzgxM8tF8WwrzaR1JwHOAIH4papeZsY6HNQ7rDuyxdtI7iqWMZJ4V66rHH4YmGZ5deewTH4s3yJ3-8OQ7zSVMIkeqC7rCqFyPPVxiiLcXkSr1nnzfQcdj06yWFVFkCTKW-VjWzm5RKzef5unoWfYu0CKr71tHF5sBi4BNd4GHrZbTes4QF_NuEtpn8XeXs8BxymsQbyOTfkWpTG-mcRD8W_k0GPv8z6g5rDtyj0qui0TzR_HOPajm-sHg0S8HzH9vPU1xUAgAA

Logs

Note : I'm working on a fix for that

System Info

REPL

Severity

annoyance