feat: introduce experimental diff strategy toggle and enhance diff handling

- Added support for an experimental diff strategy in the Cline class, allowing users to opt for a new unified diff approach.
- Updated the getDiffStrategy function to accommodate the experimental strategy, adjusting the fuzzy match threshold accordingly.
- Integrated experimentalDiffStrategy into the global state management, enabling persistence across sessions.
- Enhanced the ClineProvider and related components to handle the new experimental strategy, including UI updates for user settings.
- Improved task history management to include the experimentalDiffStrategy setting, ensuring consistency in task execution.
- Updated relevant interfaces and types to reflect the new experimentalDiffStrategy property.

webview-ui/src/context/ExtensionStateContext.tsx

@@ -50,6 +50,8 @@ export interface ExtensionStateContextType extends ExtensionState {
 	setAlwaysApproveResubmit: (value: boolean) => void
 	requestDelaySeconds: number
 	setRequestDelaySeconds: (value: number) => void
+	experimentalDiffStrategy: boolean
+	setExperimentalDiffStrategy: (value: boolean) => void
 }
 
 export const ExtensionStateContext = createContext<ExtensionStateContextType | undefined>(undefined)
@@ -72,7 +74,8 @@ export const ExtensionStateContextProvider: React.FC<{ children: React.ReactNode
 		terminalOutputLineLimit: 500,
 		mcpEnabled: true,
 		alwaysApproveResubmit: false,
-		requestDelaySeconds: 5
+		requestDelaySeconds: 0,
+		experimentalDiffStrategy: false,
 	})
 	const [didHydrateState, setDidHydrateState] = useState(false)
 	const [showWelcome, setShowWelcome] = useState(false)
@@ -208,7 +211,9 @@ export const ExtensionStateContextProvider: React.FC<{ children: React.ReactNode
 		setTerminalOutputLineLimit: (value) => setState((prevState) => ({ ...prevState, terminalOutputLineLimit: value })),
 		setMcpEnabled: (value) => setState((prevState) => ({ ...prevState, mcpEnabled: value })),
 		setAlwaysApproveResubmit: (value) => setState((prevState) => ({ ...prevState, alwaysApproveResubmit: value })),
-		setRequestDelaySeconds: (value) => setState((prevState) => ({ ...prevState, requestDelaySeconds: value }))
+		setRequestDelaySeconds: (value) => setState((prevState) => ({ ...prevState, requestDelaySeconds: value })),
+		experimentalDiffStrategy: state.experimentalDiffStrategy ?? false,
+		setExperimentalDiffStrategy: (value) => setState((prevState) => ({ ...prevState, experimentalDiffStrategy: value }))
 	}
 
 	return <ExtensionStateContext.Provider value={contextValue}>{children}</ExtensionStateContext.Provider>