fix most gc bugs - test suite running again

src/Struct/GC.js

@@ -1,4 +1,8 @@
+import { getStructReference } from '../Util/structReferences.js'
+import { RootFakeUserID } from '../Util/ID/RootID.js'
+import ID from '../Util/ID/ID.js'
 
+// TODO should have the same base class as Item
 export default class GC {
   constructor () {
     this._id = null
@@ -9,7 +13,38 @@ export default class GC {
     return true
   }
 
-  integrate () {
+  _integrate (y) {
+    const id = this._id
+    const userState = y.ss.getState(id.user)
+    if (id.clock === userState) {
+      y.ss.setState(id.user, id.clock + this._length)
+    }
+    y.ds.mark(this._id, this._length, true)
+    let n = y.os.put(this)
+    const prev = n.prev().val
+    if (prev !== null && prev.constructor === GC && prev._id.user === n.val._id.user && prev._id.clock + prev._length === n.val._id.clock) {
+      // TODO: do merging for all items!
+      prev._length += n.val._length
+      y.os.delete(n.val._id)
+      n = prev
+    }
+    if (n.val) {
+      n = n.val
+    }
+    const next = y.os.findNext(n._id)
+    if (next !== null && next.constructor === GC && next._id.user === n._id.user && next._id.clock === n._id.clock + n._length) {
+      n._length += next._length
+      y.os.delete(next._id)
+    }
+
+    if (id.user !== RootFakeUserID) {
+      if (y.connector !== null && (y.connector._forwardAppliedStructs || id.user === y.userID)) {
+        y.connector.broadcastStruct(this)
+      }
+      if (y.persistence !== null) {
+        y.persistence.saveStruct(y, this)
+      }
+    }
   }
 
   /**
@@ -37,8 +72,17 @@ export default class GC {
    * @private
    */
   _fromBinary (y, decoder) {
-    this._id = decoder.readID()
+    const id = decoder.readID()
+    this._id = id
     this._length = decoder.readVarUint()
-    return []
-  }  
+    const missing = []
+    if (y.ss.getState(id.user) < id.clock) {
+      missing.push(new ID(id.user, id.clock - 1))
+    }
+    return missing
+  }
+
+  _splitAt () {
+    return this
+  }
 }