tdf#88782 sc: autofill number sequences in merged cells

Improve FillAuto, FillAnalyse and FillSeries to continue
linear sequences of numbers in merged cells by skipping
the empty overlapped cells of the merged area, like other
spreadsheets do. For example this fix autofill, when merged
cells are used to highlight nth numbers. Instead of 1, 2 ->
1, 2, 2, 3, we get 1, 2 -> 1, 2, 3, 4 on the following fill:

+-+-+-+    +-+-+-+-+-+-+
|1| 2 | -> |1| 2 |3| 4 |
+-+-+-+    +-+-+-+-+-+-+

See the unit test document for more complex examples, and
use merge/unmerge to check the work of the algorithm. For
example, column C of the test document contains cells

EMPTY, EMPTY, EMPTY, 2, EMPTY, 4, EMPTY

calculated as 2, 4 during fill by skipping empty
overlapped cells, but keeping also the merged structure,
resulting the requested continuation of the linear sequence:

EMPTY, EMPTY, EMPTY, 6, EMPTY, 8, EMPTY

Note: special formats are not handled yet like date, string,
boolean and userlist.

Co-authored-by: Tibor Nagy (NISZ)

Change-Id: Ib431e8968f5d71e321b0e57cfb173534a0f5da31
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/103765
Tested-by: László Németh <nemeth@numbertext.org>
Reviewed-by: László Németh <nemeth@numbertext.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/sc/inc/document.hxx b/sc/inc/document.hxx
index 62315b51429f..7fcb3af03fc6 100644
--- a/sc/inc/document.hxx
+++ b/sc/inc/document.hxx
@@ -1178,7 +1178,7 @@ public:
      * @return pointer to the double value stored in a numeric cell, or NULL
      *         if the cell at specified position is not a numeric cell.
      */
-    double* GetValueCell( const ScAddress& rPos );
+    SC_DLLPUBLIC double*                      GetValueCell( const ScAddress& rPos );
 
     SC_DLLPUBLIC svl::SharedStringPool&       GetSharedStringPool();
     const svl::SharedStringPool&              GetSharedStringPool() const;