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/diagonalcurveeditorsubgroup.cc

@@ -255,12 +255,18 @@ void DiagonalCurveEditorSubGroup::editModeSwitchedOff () {
 	bool prevState;
 	prevState = editCustomConn.block(true);
 	editCustom->set_active(false);
+	customCurve->pipetteMouseOver(NULL, 0);
+	customCurve->setDirty(true);
 	if (!prevState) editCustomConn.block(false);
 	prevState = editNURBSConn.block(true);
 	editNURBS->set_active(false);
+	NURBSCurve->pipetteMouseOver(NULL, 0);
+	NURBSCurve->setDirty(true);
 	if (!prevState) editNURBSConn.block(false);
 	prevState = editParamConn.block(true);
 	editParam->set_active(false);
+	paramCurve->pipetteMouseOver(NULL, 0);
+	paramCurve->setDirty(true);
 	if (!prevState) editParamConn.block(false);
 }