fix relative angle change in guideline dialog

diff --git a/src/dialogs/guidelinedialog.cpp b/src/dialogs/guidelinedialog.cpp
index b2c867e1e01ed2023c57453c565727ddbf283d87..dc52187f8152dc83ccaa971285f0bf9dd765ce77 100644 (file)
--- a/src/dialogs/guidelinedialog.cpp
+++ b/src/dialogs/guidelinedialog.cpp
@@ -72,7 +72,9 @@ void GuidelinePropertiesDialog::_modeChanged()
 
 void GuidelinePropertiesDialog::_onApply()
 {
-    double const deg_angle = _spin_angle.get_value();
+    double deg_angle = _spin_angle.get_value();
+    if (!_mode)
+        deg_angle += _oldangle;
     Geom::Point normal;
     if ( deg_angle == 90. || deg_angle == 270. || deg_angle == -90. || deg_angle == -270.) {
         normal = Geom::Point(1.,0.);