Restore selection on click in row/column selection mode in wxGrid.

This might be less consistent with the other selection modes but seems to be
more convenient in practice, so restore the old, 2.8 behaviour and select the
entire row/column on a simply click in row/column selection mode.

Closes #12062.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64383 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/grid.cpp

@@ -3812,6 +3812,29 @@ wxGrid::DoGridCellLeftDown(wxMouseEvent& event,
         }
         else
         {
+            if ( m_selection )
+            {
+                // In row or column selection mode just clicking on the cell
+                // should select the row or column containing it: this is more
+                // convenient for the kinds of controls that use such selection
+                // mode and is compatible with 2.8 behaviour (see #12062).
+                switch ( m_selection->GetSelectionMode() )
+                {
+                    case wxGridSelectCells:
+                    case wxGridSelectRowsOrColumns:
+                        // nothing to do in these cases
+                        break;
+
+                    case wxGridSelectRows:
+                        m_selection->SelectRow(coords.GetRow());
+                        break;
+
+                    case wxGridSelectColumns:
+                        m_selection->SelectCol(coords.GetCol());
+                        break;
+                }
+            }
+
             m_waitForSlowClick = m_currentCellCoords == coords &&
                                         coords != wxGridNoCellCoords;
             SetCurrentCell( coords );