Keep track of column block positions when mass-pasting formula cells.

This speeds up the following scenario:

1) type =B1 in A1. Leave A2 empty.
2) Select A1:A2 and Ctrl-C to copy.
3) Select A3:A50000 (or longer if you so wish), and ctrl-V to paste.

This causes the broadcaster storage array in column B to be heavily
partitioned due to the empty cells interspersed between formula cells
in column A.  Without tracking the column position this would cause a
O(n^2) complexity algorithm.

Change-Id: Ic2f23c2c2bea3353c517faa73fe5412c7528bd95

1 files changed, 2 insertions, 0 deletions

diff --git a/sc/inc/document.hxx b/sc/inc/document.hxx
index f01e811eb94e..544c9b50890b 100644
--- a/sc/inc/document.hxx
+++ b/sc/inc/document.hxx
@@ -49,6 +49,7 @@
 namespace editeng { class SvxBorderLine; }
 namespace sc {
     struct FormulaGroupContext;
+    class StartListeningContext;
     class EndListeningContext;
     class CopyFromClipContext;
     struct ColumnBlockPosition;
@@ -1765,6 +1766,7 @@ public:
     void                EndListeningCell( const ScAddress& rAddress,
                                             SvtListener* pListener );
 
+    void StartListeningCell( sc::StartListeningContext& rCxt, const ScAddress& rPos, SvtListener& rListener );
     void EndListeningCell( sc::EndListeningContext& rCxt, const ScAddress& rPos, SvtListener& rListener );
 
     void EndListeningFormulaCells( std::vector<ScFormulaCell*>& rCells );