Various bugfix:

- pipette buttons are now mutually exclusive
- pipette from L curve (Lab tool) now works properly
- pipette from B curve (RGB tool) now works properly
- curve that doesn't handle the pipette mechanism hides the pipette button
- RGB components of the Tone Curves' pipette now displayed in red, green & blue
- the vertical line where the point will be inserted is displayed in grey and has a line's width of 2 pixels

rtgui/imagearea.cc

@@ -294,6 +294,15 @@ void ImageArea::unsubscribe() {
         listener->getToolBar()->stopEditMode ();
 }
 
+void ImageArea::getImageSize (int &w, int&h) {
+    if (ipc) {
+        w = ipc->getFullWidth();
+        h = ipc->getFullHeight();
+    }
+    else
+        w = h = 0;
+}
+
 void ImageArea::grabFocus (CropWindow* cw) {
     
     focusGrabber = cw;