Invalidate wxGrid best size when the grid is changed.

Don't keep using the cached best size if rows/columns are added/removed
to/from wxGrid or resized, doing this meant that we always used the first
computed best size which was way too small after adding rows/columns to the
grid.

There could be more places where the grid best size may need to be invalidated
but this should be a good start.

Closes #14761.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72704 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/grid.cpp

@@ -3068,6 +3068,8 @@ bool wxGrid::Redimension( wxGridTableMessage& msg )
         break;
     }
 
+    InvalidateBestSize();
+
     if (result && !GetBatchCount() )
         m_gridWin->Refresh();
 
@@ -7117,6 +7119,7 @@ void wxGrid::SetRowLabelSize( int width )
         }
 
         m_rowLabelWidth = width;
+        InvalidateBestSize();
         CalcWindowSizes();
         wxScrolledWindow::Refresh( true );
     }
@@ -7146,6 +7149,7 @@ void wxGrid::SetColLabelSize( int height )
         }
 
         m_colLabelHeight = height;
+        InvalidateBestSize();
         CalcWindowSizes();
         wxScrolledWindow::Refresh( true );
     }
@@ -8175,6 +8179,8 @@ void wxGrid::DoSetRowSize( int row, int height )
         m_rowBottoms[i] += diff;
     }
 
+    InvalidateBestSize();
+
     if ( !GetBatchCount() )
     {
         CalcDimensions();
@@ -8259,6 +8265,8 @@ void wxGrid::DoSetColSize( int col, int width )
         m_colRights[GetColAt(colPos)] += diff;
     }
 
+    InvalidateBestSize();
+
     if ( !GetBatchCount() )
     {
         CalcDimensions();
@@ -8668,11 +8676,6 @@ wxSize wxGrid::DoGetBestSize() const
     wxSize size(self->SetOrCalcColumnSizes(true) - m_rowLabelWidth + m_extraWidth,
                 self->SetOrCalcRowSizes(true) - m_colLabelHeight + m_extraHeight);
 
-    // NOTE: This size should be cached, but first we need to add calls to
-    // InvalidateBestSize everywhere that could change the results of this
-    // calculation.
-    // CacheBestSize(size);
-
     return wxSize(size.x + m_rowLabelWidth, size.y + m_colLabelHeight)
             + GetWindowBorderSize();
 }