From ed78f6e56fc6c5e68798b6aad5b96af6e49a5ed2 Mon Sep 17 00:00:00 2001
From: siliconserf <32206614+siliconserf@users.noreply.github.com>
Date: Thu, 4 Jun 2020 14:25:27 -0700
Subject: [PATCH] Update abstractModel.py

---
 manuskript/models/abstractModel.py | 47 ++++++++++++++++++++----------
 1 file changed, 31 insertions(+), 16 deletions(-)

diff --git a/manuskript/models/abstractModel.py b/manuskript/models/abstractModel.py
index a536084..f49a1cb 100644
--- a/manuskript/models/abstractModel.py
+++ b/manuskript/models/abstractModel.py
@@ -36,6 +36,9 @@ class abstractModel(QAbstractItemModel):
     - Interface with QModelIndex and stuff
     - XML Import / Export
     - Drag'n'drop
+    
+    Row => item/abstractModel/etc.
+    Col => data sub-element. Col 1 (second counting) is ID for all model types.
 
     """
     def __init__(self, parent):
@@ -415,21 +418,32 @@ class abstractModel(QAbstractItemModel):
         # In case of copy actions, items might be duplicates, so we need new IDs.
         # But they might not be, if we cut, then paste. Paste is a Copy Action.
         # The first paste would not need new IDs. But subsequent ones will.
+        
+        # Recursively change the existing IDs to new, unique values. No need to strip out the old
+        # even if they are not duplicated in pasting. There is no practical need for ID conservation.
+
         if action == Qt.CopyAction:
             IDs = self.rootItem.listAllIDs()
-
+            
             for item in items:
                 if item.ID() in IDs:
-                    # Recursively remove ID. So will get a new one when inserted.
-                    def stripID(item):
-                        item.setData(Outline.ID, None)
-                        for c in item.children():
-                            stripID(c)
-
-                    stripID(item)
-
+                    def makeNewID(item):    
+                        k = 1
+                        while True: # Python doesn't have "Do...While"
+                            ks = str(k)
+                            if ks not in IDs:
+                                item.setData(Outline.ID,ks)
+                                IDs.append(ks) #Keep track of new IDs allocated.
+                                for c in item.children():
+                                    makeNewID(c)
+                                break # Actual Loop Exit
+                            else:
+                                k = k+1 # Try the next candidate ID
+                                
+                    makeNewID(item)       
         r = self.insertItems(items, beginRow, parent)
-
+        
+        
         return r
 
     ################# ADDING AND REMOVING #################
@@ -448,13 +462,13 @@ class abstractModel(QAbstractItemModel):
 
         # Insert only if parent is folder
         if parentItem.isFolder():
-            self.beginInsertRows(parent, row, row + len(items) - 1)
-
+            self.beginInsertRows(parent, row, row + len(items) - 1) # Create space.
+            
             for i in items:
                 parentItem.insertChild(row + items.index(i), i)
-
+            
             self.endInsertRows()
-
+            
             return True
 
         else:
@@ -507,8 +521,9 @@ class abstractModel(QAbstractItemModel):
         else:
             parentItem = parent.internalPointer()
 
-        self._removingRows = True  # Views that are updating can easily know
-                                   # if this is due to row removal.
+        self._removingRows = True 
+        # Views that are updating can easily know
+        # if this is due to row removal.
         self.beginRemoveRows(parent, row, row + count - 1)
         for i in range(count):
             item = parentItem.removeChild(row)