fdo#529470: I can't remove a path in AutoText dialog

This is, not surprisingly, somewhat weird code, but I think this patch does
what is necessary, it does fix the bug.

Change-Id: Ie1947b311f1455ba48a904f5ef42ad92899fac31

framework/source/services/pathsettings.cxx

@@ -402,8 +402,8 @@ private:
         So real user defined paths can be extracted from the list of
         fix internal paths !
      */
-    void impl_purgeKnownPaths(const PathSettings::PathInfo& rPath,
-                                     OUStringList&           lList);
+    void impl_purgeKnownPaths(PathSettings::PathInfo& rPath,
+                              OUStringList&           lList);
 
     /** rebuild the member m_lPropDesc using the path list m_lPaths. */
     void impl_rebuildPropertyDescriptor();
@@ -1042,10 +1042,13 @@ OUStringList PathSettings::impl_convertOldStyle2Path(const OUString& sOldStylePa
     return lList;
 }
 
-void PathSettings::impl_purgeKnownPaths(const PathSettings::PathInfo& rPath,
-                                               OUStringList&           lList)
+void PathSettings::impl_purgeKnownPaths(PathSettings::PathInfo& rPath,
+                                        OUStringList&           lList)
 {
-    OUStringList::const_iterator pIt;
+    OUStringList::iterator pIt;
+
+    // Erase items in the internal path list from lList.
+    // Also erase items in the internal path list from the user path list.
     for (  pIt  = rPath.lInternalPaths.begin();
            pIt != rPath.lInternalPaths.end();
          ++pIt                                 )
@@ -1054,7 +1057,29 @@ void PathSettings::impl_purgeKnownPaths(const PathSettings::PathInfo& rPath,
         OUStringList::iterator pItem = lList.find(rItem);
         if (pItem != lList.end())
             lList.erase(pItem);
+        pItem = rPath.lUserPaths.find(rItem);
+        if (pItem != rPath.lUserPaths.end())
+            rPath.lUserPaths.erase(pItem);
+    }
+
+    // Erase itsems not in lList from the user path list.
+    pIt = rPath.lUserPaths.begin();
+    while ( pIt != rPath.lUserPaths.end() )
+    {
+        const OUString& rItem = *pIt;
+        OUStringList::iterator pItem = lList.find(rItem);
+        if ( pItem == lList.end() )
+        {
+            rPath.lUserPaths.erase(pIt);
+            pIt = rPath.lUserPaths.begin();
+        }
+        else
+        {
+            ++pIt;
+        }
     }
+
+    // Erase items in the user path list from lList.
     for (  pIt  = rPath.lUserPaths.begin();
            pIt != rPath.lUserPaths.end();
          ++pIt                             )
@@ -1065,6 +1090,7 @@ void PathSettings::impl_purgeKnownPaths(const PathSettings::PathInfo& rPath,
             lList.erase(pItem);
     }
 
+    // Erase the write path from lList
     OUStringList::iterator pItem = lList.find(rPath.sWritePath);
     if (pItem != lList.end())
         lList.erase(pItem);