Open new sprites in the center of the current sprite.

TODO.txt

@@ -1,7 +1,6 @@
 For next release
 ----------------
 
-+ After creating or opening a sprite, it should be shown centered in the editor.
 + Mini-look for sliders in palette editor (add ISliderBackground to draw RGB/HSV sliders
   with a customized background).
 + Fix palette editor to avoid generating a lot of consecutive Undo actions.

src/raster/sprite.cpp

@@ -425,6 +425,7 @@ SpriteImpl::SpriteImpl(Sprite* sprite, int imgtype, int width, int height, int n
   m_preferred.scroll_x = 0;
   m_preferred.scroll_y = 0;
   m_preferred.zoom = 0;
+  m_preferred.virgin = true;
 
   // Generate palette
   Palette pal(0, ncolors);

src/raster/sprite.h

@@ -41,6 +41,7 @@ struct PreferredEditorSettings
   int scroll_x;
   int scroll_y;
   int zoom;
+  bool virgin;
 };
 
 typedef std::vector<Palette*> PalettesList;

src/widgets/editor/editor.cpp

@@ -159,6 +159,20 @@ void Editor::editor_set_sprite(Sprite* sprite)
     m_zoom = preferred.zoom;
 
     editor_update();
+
+    if (preferred.virgin) {
+      JWidget view = jwidget_get_view(this);
+      JRect vp = jview_get_viewport_position(view);
+
+      preferred.virgin = false;
+      preferred.scroll_x = -jrect_w(vp)/2 + (sprite->getWidth()/2);
+      preferred.scroll_y = -jrect_h(vp)/2 + (sprite->getHeight()/2);
+
+      m_sprite->setPreferredEditorSettings(preferred);
+
+      jrect_free(vp);
+    }
+
     editor_set_scroll(m_offset_x + preferred.scroll_x,
 		      m_offset_y + preferred.scroll_y,
 		      false);