Commits on Oct 13, 2021

1. BUG: Fix autocomplete in Python console …

   Autocomplete returned list of attributes for non-existing members of a class. For example: `myobj.nonexisting.a` returned all the completions for `myobj.a`.
   Fixed by clearing the list of completions if a non-existing attribute is used.
   
   Also fixed the interpreter getting stuck in an error state after invalid autocomplete (or other Python errors).
   Fixed by always resetting the error state before command execution and after failed command executions.

   

   lassoan committed Oct 13, 2021
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2. ENH: Improve Python autocomplete list ordering …

   Before this change, a strict alphabetical sorting was used, which means that order of attributes was:
   - uppercase letters: constants + internal classes + VTK methods
   - underscore: private attributes
   - lowercase letters: Python and Qt attributes and methods
   
   For example attributes of a Qt class:
   
   ```
   AllowNestedDocks
   AllowTabbedDocks
   AnimatedDocks
   DockOption()
   ...
   PdmPhysicalDpiY
   PdmWidth
   PdmWidthMM
   RenderFlag()
   RenderFlags()
   VerticalTabs
   __bool__()
   __class__()
   __delattr__()
   __dict__
   __dir__()
   __doc__
   __eq__()
   __format__()
   ...
   __setattr__()
   __sizeof__()
   __str__()
   __subclasshook__()
   __weakref__
   acceptDrops
   accessibleDescription
   accessibleName
   actionEvent()
   addToolBar()
   ...
   windowRole()
   windowState()
   windowTitle
   windowTitleChanged()
   windowType()
   x
   y
   ```
   
   This means that the user must scroll through a lot of irrelevant parts before gets to method names.
   
   After this change, attributes are grouped into the following categories and displayed in this order:
   - Python and Qt attributes and methods (starts with lowercase letter)
   - VTK methods + static classes and types (starts with uppercase letter, ends with parenthesis)
   - constants (starts with uppercase letter, does not end with parenthesis)
   - private attributes (starts with underscore)
   
   Case insensitive comparison is used within each group.
   
   Example:
   
   ```
   acceptDrops
   accessibleDescription
   accessibleName
   actionEvent()
   actions()
   activateWindow()
   addAction()
   ...
   windowType()
   winId()
   x
   y
   DockOption()
   DockOptions()
   PaintDeviceMetric()
   RenderFlag()
   RenderFlags()
   AllowNestedDocks
   AllowTabbedDocks
   AnimatedDocks
   DrawChildren
   ...
   PdmWidthMM
   VerticalTabs
   __bool__()
   __class__()
   __delattr__()
   ...
   __str__()
   __subclasshook__()
   __weakref__
   ```

   

   lassoan committed Oct 13, 2021
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