Fix crash when opening LFP Viewer Beta drawer without canvas

Author: ethanbb

Source/Plugins/LfpDisplayNodeBeta/LfpDisplayCanvas.cpp

@@ -1808,6 +1808,9 @@ void LfpDisplay::paint(Graphics& g)
 
 void LfpDisplay::refresh()
 {
+    // Ensure the lfpChannelBitmap has been initialized
+    if (lfpChannelBitmap.isNull()) { resized(); }
+
     // X-bounds of this update
     int fillfrom = canvas->lastScreenBufferIndex[0];
     int fillto = (canvas->screenBufferIndex[0]);

Source/Processors/Editors/VisualizerEditor.cpp

@@ -201,7 +201,7 @@ void VisualizerEditor::buttonClicked (Button* button)
     GenericEditor::buttonClicked (button);
 
     // Handle the buttons to open the canvas in a tab or window
-    if (canvas == nullptr)
+    if ((button == windowSelector || button == tabSelector) && canvas == nullptr)
     {
         canvas = createNewCanvas();
         canvas->update();