gui: make plot windows children of the node, so they close automatically

Change-Id: I025bff02bc566be8bbaa8d90bf0035d1e2bf2a69
Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/30494
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Georg Brandl <g.brandl@fz-juelich.de>

frappy/gui/nodewidget.py

@@ -273,7 +273,7 @@ class NodeWidget(QWidget):
             plot.addCurve(self._node, module, param)
             plot.setCurveColor(module, param, Colors.colors[len(plot.curves) % 6])
         else:
-            plot = getPlotWidget()
+            plot = getPlotWidget(self)
             plot.addCurve(self._node, module, param)
             plot.setCurveColor(module, param, Colors.colors[1])
             self._activePlots[(module, param)] = plot

frappy/gui/plotting.py

@@ -9,14 +9,20 @@ except ImportError:
 
 from frappy.gui.util import Colors
 from frappy.gui.qt import QWidget, QVBoxLayout, QLabel, Qt, pyqtSignal
-def getPlotWidget():
+
+
+def getPlotWidget(parent):
     if pg:
         pg.setConfigOption('background', Colors.colors['plot-bg'])
         pg.setConfigOption('foreground', Colors.colors['plot-fg'])
 
     if pg is None:
-        return PlotPlaceHolderWidget()
-    return PlotWidget()
+        window = PlotPlaceHolderWidget(parent)
+    else:
+        window = PlotWidget(parent)
+    window.setWindowFlags(Qt.WindowType.Window)
+    return window
+
 
 class PlotPlaceHolderWidget(QWidget):
     closed = pyqtSignal(object)