merge upstream changes

Signed-off-by: SoftFever <103989404+SoftFever@users.noreply.github.com>

src/slic3r/GUI/RecenterDialog.cpp

@@ -22,6 +22,8 @@ RecenterDialog::RecenterDialog(wxWindow* parent, wxWindowID id, const wxString&
 
     init_bitmap();
 
+    SetBackgroundColour(*wxWHITE);
+
     auto* main_sizer = new wxBoxSizer(wxVERTICAL);
     auto* button_sizer = new wxBoxSizer(wxHORIZONTAL);