Improve drag and drop implementation for NSTextView so that an ongoing

drag operation no longer changes the current selection of the target
view. Also fix an issue with dropping text into an empty text view.


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@27125 72102866-910b-0410-8b05-ffd578937521

Headers/AppKit/NSTextView.h

@@ -144,8 +144,8 @@ therefore be stored in the NSLayoutManager to avoid problems.
     /* YES if delegate responds to
        `textView:willChangeSelectionFromCharacterRange:toCharacterRange:' */
     unsigned delegate_responds_to_will_change_sel:1;
-    /* YES if a DnD operation is in progress with this as the target view */
-    unsigned isDragTarget:1;
+    /* YES if a DnD operation controls the insertion point in this text view */
+    unsigned drag_target_hijacks_insertion_point:1;
 
     unsigned uses_find_panel:1;
     unsigned accepts_glyph_info:1;
@@ -226,10 +226,15 @@ therefore be stored in the NSLayoutManager to avoid problems.
   */
   int _currentInsertionPointMovementDirection;
 
-  /* Ivar to store the original range so it can be restored after a DnD
-   * operation is cancelled (the mouse moves back out of the view).
+  /* Ivar to store the location where text is going to be inserted during
+   * a DnD operation.
+   * Note: This used to be a range attribute with a different meaning; the
+   * _dragTargetUnused attribute is present just to preserve the size of
+   * NSTextView instances.
+   * FIXME: Drop this attribute on the next major release.
    */
-  NSRange _dragTargetSelectionRange;
+  unsigned int _dragTargetLocation;
+  unsigned int _dragTargetUnused;
   /*
   TODO:
   Still need to figure out what "proper behavior" is when moving between two