Make duplicating better: description, closetime, logscale

Known issue: some markets like https://manifold.markets/FFSX/rojo-ronald-jones don't duplicate because too much stuff in JSON...?

web/components/copy-contract-button.tsx

@@ -33,22 +33,29 @@ export function DuplicateContractButton(props: {
 
 // Pass along the Uri to create a new contract
 function duplicateContractHref(contract: Contract) {
+  const descriptionString = JSON.stringify(contract.description)
+  // Don't set a closeTime that's in the past
+  const closeTime =
+    (contract?.closeTime ?? 0) <= Date.now() ? 0 : contract.closeTime
   const params = {
     q: contract.question,
-    closeTime: contract.closeTime || 0,
-    description:
-      (contract.description ? `${contract.description}\n\n` : '') +
-      `(Copied from https://${ENV_CONFIG.domain}${contractPath(contract)})`,
+    closeTime,
+    description: descriptionString,
     outcomeType: contract.outcomeType,
   } as Record<string, any>
 
   if (contract.outcomeType === 'PSEUDO_NUMERIC') {
     params.min = contract.min
     params.max = contract.max
-    params.isLogScale = contract.isLogScale
+    if (contract.isLogScale) {
+      // Conditional, because `?isLogScale=false` evaluates to `true`
+      params.isLogScale = true
+    }
     params.initValue = getMappedValue(contract)(contract.initialProbability)
   }
 
+  // TODO: Support multiple choice markets?
+
   if (contract.groupLinks && contract.groupLinks.length > 0) {
     params.groupId = contract.groupLinks[0].groupId
   }

web/pages/create.tsx

@@ -207,6 +207,7 @@ export function NewContract(props: {
     max: MAX_DESCRIPTION_LENGTH,
     placeholder: descriptionPlaceholder,
     disabled: isSubmitting,
+    defaultValue: JSON.parse(params?.description ?? '{}'),
   })
 
   const isEditorFilled = editor != null && !editor.isEmpty