Merge pull request #2266 from SasView/2215-plot-legend-enabledisable-…

…does-not-persist

Add persistent legend visibility toggle

src/sas/qtgui/Plotting/Plotter.py

@@ -88,6 +88,8 @@ def __init__(self, parent=None, manager=None, quickplot=False):
         self.toolbar._actions['pan'].triggered.connect(self._pan)
         self.toolbar._actions['zoom'].triggered.connect(self._zoom)
 
+        self.legendVisible = True
+
         parent.geometry()
 
     @property
@@ -258,7 +260,7 @@ def plot(self, data=None, color=None, marker=None, hide_error=False, transform=T
                 self.legend = ax.legend(loc='upper right', shadow=True)
             if self.legend:
                 self.legend.set_picker(True)
-
+            self.legend.set_visible(self.legendVisible)
         # Current labels for axes
         if self.yLabel and not is_fit:
             ax.set_ylabel(self.yLabel)
@@ -303,7 +305,7 @@ def onResize(self, event):
         """
         Resize the legend window/font on canvas resize
         """
-        if not self.showLegend:
+        if not self.showLegend or not self.legendVisible:
             return
         width = _legendResize(event.width, self.parent)
         # resize the legend to follow the canvas width.
@@ -799,8 +801,9 @@ def onToggleLegend(self):
         if not self.showLegend:
             return
 
-        visible = self.legend.get_visible()
-        self.legend.set_visible(not visible)
+        #visible = self.legend.get_visible()
+        self.legendVisible = not self.legendVisible
+        self.legend.set_visible(self.legendVisible)
         self.canvas.draw_idle()
 
     def onCusotmizeLabel(self):