- vector: ensure separators don't overlap with other rectangles so that

they render correctly when have RGBA alpha channel
- GUI: update_preview() after Data Dialog return to ensure preview in sync
- GUI: add automatic info feedback to "Automatic" combo item of size/row/height
  comboboxes
- backend_qt: always call getMaxRectsRightBottom() for render fudge; use
  ZBarcode_Clear() instead of ZBarcode_Delete() after 1st call
- update BWIPP to latest & add some MICROQR tests to exercise optimize change

frontend_qt/mainwindow.h

@@ -144,12 +144,14 @@ protected:
 
     void createActions();
     void createMenu();
-    void enableActions(bool enabled);
+    void enableActions();
 
     void copy_to_clipboard(const QString &filename, const QString &name, const char *mimeType = nullptr);
 
     void errtxtBar_clear();
-    void errtxtBar_set(bool isError);
+    void errtxtBar_set();
+
+    void automatic_info_set();
 
     QLineEdit *get_seg_textbox(int seg_no);
     QComboBox *get_seg_eci(int seg_no);