omni-node: --dev sets manual seal and allows --chain to be set

cumulus/polkadot-omni-node/lib/src/cli.rs

@@ -133,7 +133,8 @@ pub struct Cli<Config: CliConfig> {
 	/// as if it was part of a parachain.
 	///
 	/// The `--dev` flag sets the `dev_block_time` to a default value of 3000ms unless explicitly
-	/// provided.	#[arg(long)]
+	/// provided.
+	#[arg(long)]
 	pub dev_block_time: Option<u64>,
 
 	/// EXPERIMENTAL: Use slot-based collator which can handle elastic scaling.

templates/parachain/runtime/src/configs/mod.rs

@@ -63,8 +63,7 @@ use super::{
 	MessageQueue, Nonce, PalletInfo, ParachainSystem, Runtime, RuntimeCall, RuntimeEvent,
 	RuntimeFreezeReason, RuntimeHoldReason, RuntimeOrigin, RuntimeTask, Session, SessionKeys,
 	System, WeightToFee, XcmpQueue, AVERAGE_ON_INITIALIZE_RATIO, EXISTENTIAL_DEPOSIT, HOURS,
-	MAXIMUM_BLOCK_WEIGHT, MICRO_UNIT, MINIMUM_PERIOD, NORMAL_DISPATCH_RATIO, SLOT_DURATION,
-	VERSION,
+	MAXIMUM_BLOCK_WEIGHT, MICRO_UNIT, NORMAL_DISPATCH_RATIO, SLOT_DURATION, VERSION,
 };
 use xcm_config::{RelayLocation, XcmOriginToTransactDispatchOrigin};
 
@@ -134,7 +133,7 @@ impl pallet_timestamp::Config for Runtime {
 	/// A timestamp: milliseconds since the unix epoch.
 	type Moment = u64;
 	type OnTimestampSet = Aura;
-	type MinimumPeriod = ConstU64<MINIMUM_PERIOD>;
+	type MinimumPeriod = ConstU64<0>;
 	type WeightInfo = ();
 }
 

templates/parachain/runtime/src/lib.rs

@@ -187,9 +187,6 @@ mod block_times {
 	// NOTE: Currently it is not possible to change the slot duration after the chain has started.
 	// Attempting to do so will brick block production.
 	pub const SLOT_DURATION: u64 = MILLI_SECS_PER_BLOCK;
-
-	/// Minimum period between blocks set for the `pallet_timestamp`.
-	pub const MINIMUM_PERIOD: u64 = SLOT_DURATION / 2;
 }
 pub use block_times::*;