Make Imviz panning more seamless

jdaviz/configs/imviz/plugins/viewers.py

@@ -34,6 +34,17 @@ def __init__(self, *args, **kwargs):
         self.state.show_axes = False
         self.figure.fig_margin = {'left': 0, 'bottom': 0, 'top': 0, 'right': 0}
 
+        # By default, glue computes a fixed resolution buffer that matches the
+        # axes - but this means that when panning, one sees white outside of
+        # the original buffer until the buffer updates again, thus there is a
+        # lag in the image display. By increasing the external padding to 0.5
+        # the image is made larger by 50% along all four sides, helping create
+        # the illusion of smooth panning. We can increase this further to
+        # improve the panning experience, but this can cause a larger delay
+        # when the image does need to update as it will be more computationally
+        # intensive.
+        self.state.image_external_padding = 0.5
+
     def on_mouse_or_key_event(self, data):
 
         # Find visible layers

setup.cfg

@@ -23,7 +23,7 @@ install_requires =
     bqplot>=0.12.29
     bqplot-image-gl>=1.4.1
     glue-core>=1.2.1
-    glue-jupyter>=0.8.1
+    glue-jupyter>=0.9
     echo>=0.5.0
     ipyvue>=1.4.1
     ipyvuetify>=1.7.0