Added "self.moving = False" in InfLineLabel class

Added  "self.moving = False" in  InfLineLabel class to solve the error message when clicking on the label.

    |  AttributeError: 'InfLineLabel' object has no attribute 'moving'

pyqtgraph/graphicsItems/InfiniteLine.py

@@ -325,6 +325,7 @@ class InfLineLabel(TextItem):
     def __init__(self, line, text="", movable=False, position=0.5, anchors=None, **kwds):
         self.line = line
         self.movable = movable
+        self.moving = False
         self.orthoPos = position  # text will always be placed on the line at a position relative to view bounds
         self.format = text
         self.line.sigPositionChanged.connect(self.valueChanged)