Add wxGrid::Enable{Row,Col}Resize()

These functions are needed to allow resizing the rows/columns whose size
was fixed by Disable{Row,Col}Resize() as otherwise the effect of a call
to the latter function can't be undone at all.

include/wx/generic/grid.h

@@ -1904,6 +1904,10 @@ public:
     void DisableRowResize(int row) { DoDisableLineResize(row, m_setFixedRows); }
     void DisableColResize(int col) { DoDisableLineResize(col, m_setFixedCols); }
 
+        // and then resizing them may be re-enabled again later
+    void EnableRowResize(int row) { DoEnableLineResize(row, m_setFixedRows); }
+    void EnableColResize(int col) { DoEnableLineResize(col, m_setFixedCols); }
+
         // These function return true if resizing rows/columns by dragging
         // their edges inside the grid is enabled. Note that this doesn't cover
         // dragging their separators in the label windows (which can be enabled
@@ -2963,8 +2967,9 @@ private:
     void DoSetSizes(const wxGridSizesInfo& sizeInfo,
                     const wxGridOperations& oper);
 
-    // common part of Disable{Row,Col}Resize and CanDrag{Row,Col}Size
+    // common part of {Disable,Enable}{Row,Col}Resize and CanDrag{Row,Col}Size
     void DoDisableLineResize(int line, wxGridFixedIndicesSet *& setFixed);
+    void DoEnableLineResize(int line, wxGridFixedIndicesSet* setFixed);
     bool DoCanResizeLine(int line, const wxGridFixedIndicesSet *setFixed) const;
 
     // Helper of Render(): get grid size, origin offset and fill cell arrays

interface/wx/grid.h

@@ -4655,6 +4655,17 @@ public:
     */
     void DisableHidingColumns();
 
+    /**
+        Enable interactively resizing a column if it was previously forbidden.
+
+        Calling this function only makes sense if the row resizing had been
+        previously forbidden using DisableColResize(), as it simply undoes its
+        effect.
+
+        @since 3.3.0
+     */
+    void EnableColResize(int col);
+
     /**
         Enables or disables cell dragging with the mouse.
     */
@@ -4726,6 +4737,17 @@ public:
     */
     bool EnableHidingColumns(bool enable = true);
 
+    /**
+        Enable interactively resizing a row if it was previously forbidden.
+
+        Calling this function only makes sense if the row resizing had been
+        previously forbidden using DisableRowResize(), as it simply undoes its
+        effect.
+
+        @since 3.3.0
+     */
+    void EnableRowResize(int row)l
+
     /**
         Returns the column ID of the specified column position.
     */

src/generic/grid.cpp

@@ -9913,6 +9913,12 @@ void wxGrid::DoDisableLineResize(int line, wxGridFixedIndicesSet *& setFixed)
     setFixed->insert(line);
 }
 
+void wxGrid::DoEnableLineResize(int line, wxGridFixedIndicesSet* setFixed)
+{
+    if ( setFixed )
+        setFixed->erase(line);
+}
+
 bool
 wxGrid::DoCanResizeLine(int line, const wxGridFixedIndicesSet *setFixed) const
 {