Added mention of control-click to drag selection

CHANGES.md

@@ -4,6 +4,8 @@ Full changelog
 v0.13.0 (unreleased)
 --------------------
 
+* Give instructions for how to move selections in status tip.
+
 * Improve the display of data cube slice labels to include only the
   precision required given the separation of world coordinate values.
   [#1500]

glue/viewers/common/qt/mouse_mode.py

@@ -200,7 +200,7 @@ class RoiMode(RoiModeBase):
     mouse release
     """
 
-    status_tip = "CLICK and DRAG to define selection"
+    status_tip = "CLICK and DRAG to define selection, CTRL-CLICK and DRAG to move selection"
 
     def __init__(self, viewer, **kwargs):
 
@@ -366,8 +366,8 @@ class PolyMode(ClickRoiMode):
     tool_tip = ('Lasso a region of interest\n'
                 '  ENTER accepts the path\n'
                 '  ESCAPE clears the path')
-    status_tip = ('CLICK and DRAG to define lasso, CLICK multiple times to '
-                  'define polygon, ENTER to finalize, ESCAPE to cancel')
+    status_tip = ('CLICK and DRAG (or CLICK multiple times) to define selection,'
+                  ' ENTER to finalize, ESC to cancel, CTRL-CLICK and DRAG to move selection')
     shortcut = 'G'
 
     def __init__(self, viewer, **kwargs):
@@ -389,8 +389,8 @@ class LassoMode(RoiMode):
     tool_tip = ('Lasso a region of interest\n'
                 '  ENTER accepts the path\n'
                 '  ESCAPE clears the path')
-    status_tip = ('CLICK and DRAG to define lasso, CLICK multiple times to '
-                  'define polygon, ENTER to finalize, ESCAPE to cancel')
+    status_tip = ('CLICK and DRAG (or CLICK multiple times) to define selection,'
+                  ' ENTER to finalize, ESC to cancel, CTRL-CLICK and DRAG to move selection')
     shortcut = 'L'
 
     def __init__(self, viewer, **kwargs):