Implement wxDataViewCtrl::SetRowHeight() for wxGTK.

Also document that this method can only be used to increase the row height
compared to the default, not to make it smaller.

See #12749.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67920 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/dataview.cpp

@@ -1333,6 +1333,17 @@ gtk_wx_cell_renderer_get_size (GtkCellRenderer *renderer,
 
     wxSize size = cell->GetSize();
 
+    wxDataViewCtrl * const ctrl = cell->GetOwner()->GetOwner();
+
+    // Uniform row height, if specified, overrides the value returned by the
+    // renderer.
+    if ( !ctrl->HasFlag(wxDV_VARIABLE_LINE_HEIGHT) )
+    {
+        const int uniformHeight = ctrl->GTKGetUniformRowHeight();
+        if ( uniformHeight > 0 )
+            size.y = uniformHeight;
+    }
+
     int xpad, ypad;
     gtk_cell_renderer_get_padding(renderer, &xpad, &ypad);
     int calc_width  = xpad * 2 + size.x;
@@ -4473,6 +4484,8 @@ void wxDataViewCtrl::Init()
     m_internal = NULL;
 
     m_cols.DeleteContents( true );
+
+    m_uniformRowHeight = -1;
 }
 
 bool wxDataViewCtrl::Create(wxWindow *parent,
@@ -5103,6 +5116,12 @@ wxDataViewCtrl::GetItemRect(const wxDataViewItem& WXUNUSED(item),
     return wxRect();
 }
 
+bool wxDataViewCtrl::SetRowHeight(int rowHeight)
+{
+    m_uniformRowHeight = rowHeight;
+    return true;
+}
+
 void wxDataViewCtrl::DoSetExpanderColumn()
 {
     gtk_tree_view_set_expander_column( GTK_TREE_VIEW(m_treeview),