-Werror=deprecated-copy (GCC trunk towards GCC 9)

SwVectorModifyBase and its DestructorPolicy look like they beg for clean up, but
it's not immediately clear to me what the best solution would be, so just mark
the dangerous status quo with a TODO comment for now.

Change-Id: I24164553baefb124969d4ac37247dabdaead0cd5
Reviewed-on: https://gerrit.libreoffice.org/58169
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

sw/inc/docary.hxx

@@ -110,6 +110,14 @@ public:
                 delete *it;
     }
 
+    //TODO: These functions are apparently brittle (but the copy functions are actually used by the
+    // code; the move functions will be implicitly-defined as deleted anyway) and should probably
+    // only be used with DestructorPolicy::KeepELements:
+    SwVectorModifyBase(SwVectorModifyBase const &) = default;
+    SwVectorModifyBase(SwVectorModifyBase &&) = default;
+    SwVectorModifyBase & operator =(SwVectorModifyBase const &) = default;
+    SwVectorModifyBase & operator =(SwVectorModifyBase &&) = default;
+
     void DeleteAndDestroy(int aStartIdx, int aEndIdx)
     {
         if (aEndIdx < aStartIdx)