allow dynamic resizing of display rows and columns in variable editor * variable-editor-model.h, variable-editor-model.cc (ve_base_model::maybe_resize_rows, ve_base_model::maybe_resize_columns, numeric_model::maybe_resize_rows, numeric_model::maybe_resize_columns, cell_model::maybe_resize_rows, cell_model::maybe_resize_columns, struct_vector_model::maybe_resize_rows, struct_model::maybe_resize_rows, struct_model::maybe_resize_columns, variable_editor_model::change_display_size): New functions. (variable_editor_model::update_data): Call change_display_size if row or column size changes. (variable_editor_model::maybe_resize_rows, variable_editor_model::maybe_resize_columns): New functions. * variable-editor.h, variable-editor.cc (variable_editor_tab::variable_editor_tab): Initialize all data members. (variable_editor_tab::keyPressEvent): New function.

--- a/libgui/src/variable-editor.h	Wed Feb 14 16:21:53 2018 -0500
+++ b/libgui/src/variable-editor.h	Wed Feb 14 19:02:58 2018 -0500
@@ -49,7 +49,8 @@
 public:
 
   var_editor_tab (QStackedWidget *widget_stack, QWidget *p = nullptr)
-    : QWidget (p), m_widget_stack (widget_stack)
+    : QWidget (p), m_model (nullptr), m_widget_stack (widget_stack),
+      m_edit_view_idx (-1), m_disp_view_idx (-1)
   { }
 
   ~var_editor_tab (void) = default;
@@ -73,6 +74,8 @@
 
   bool has_focus (void) const;
 
+  void keyPressEvent (QKeyEvent *event);
+
 public slots:
 
   void set_editable (bool);