Disable mpp flags in invoice creation if jit channel is required and consider available liquidity #9587
+23
−9
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Considers the available inbound liquidity when deciding if the client requires a just-in-time channel to receive the requested amount. Also disables the MPP feature flags in the invoice if client requests a jit channel to prevent the LSP from opening multiple channels to it (one for each htlc).
Also makes the difference between the static scid alias we create if there is no existing channel and the "regular" scid aliases more clear by renaming two functions, so we don't call two different things 'scid alias'.
Required for #9584