Preserve size of wxGrid rows/columns when hiding and showing them back.

Previously, if a wxGrid row or column was hidden by setting its size to 0, its
original size was lost. Change this so that it's preserved now and can be
restored by setting the size to the special -1 value later.

Closes #14133.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72491 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/grid.h

@@ -1357,13 +1357,13 @@ public:
     // ------ row and col sizes
     void     SetDefaultRowSize( int height, bool resizeExistingRows = false );
     void     SetRowSize( int row, int height );
-    void     HideRow(int row) { SetRowSize(row, 0); }
-    void     ShowRow(int row) { SetRowSize(row, -1); }
+    void     HideRow(int row) { DoSetRowSize(row, 0); }
+    void     ShowRow(int row) { DoSetRowSize(row, -1); }
 
     void     SetDefaultColSize( int width, bool resizeExistingCols = false );
     void     SetColSize( int col, int width );
-    void     HideCol(int col) { SetColSize(col, 0); }
-    void     ShowCol(int col) { SetColSize(col, -1); }
+    void     HideCol(int col) { DoSetColSize(col, 0); }
+    void     ShowCol(int col) { DoSetColSize(col, -1); }
 
     // the row and column sizes can be also set all at once using
     // wxGridSizesInfo which holds all of them at once
@@ -2295,6 +2295,16 @@ private:
                       const wxGridCellCoords& topLeft,
                       const wxGridCellCoords& bottomRight );
 
+    // Implementation of public Set{Row,Col}Size() and {Hide,Show}{Row,Col}().
+    // They interpret their height or width parameter slightly different from
+    // the public methods where -1 in it means "auto fit to the label" for the
+    // compatibility reasons. Here it means "show a previously hidden row or
+    // column" while 0 means "hide it" just as in the public methods. And any
+    // positive values are handled naturally, i.e. they just specify the size.
+    void DoSetRowSize( int row, int height );
+    void DoSetColSize( int col, int width );
+
+
     // these sets contain the indices of fixed, i.e. non-resizable
     // interactively, grid rows or columns and are NULL if there are no fixed
     // elements (which is the default)