Link.view does not work correctly in the app

[NathanDunfield]

On macOS with SnapPy 3.3.1:

In[1]: L = Link('4a1')

In[2]: L.view()

Out[2]: <plink.editor.LinkDisplay at 0x1098874d0>

In[3]: Exception in Tkinter callback
Traceback (most recent call last):
  File "/Users/runner/work/frameworks/frameworks/Python-3.14/dist/Python.framework/Versions/3.14/lib/python3.14/tkinter/__init__.py", line 2088, in __call__
  File "/Applications/SnapPy.app/Contents/Frameworks/Python.framework/Versions/Current/lib/python3.14/site-packages/plink/editor.py", line 134, in _key_release
    raise RuntimeError('Subclasses must override _key_press')
RuntimeError: Subclasses must override _key_press

This is a regression from SnapPy 3.2.

[culler]

First of all, that error is itself an error. It should read "sublclasses must override _key_release". I made a copy-paste error.

I added that check because PLinkBase has bindings for both of those events to those two methods. I thought that meant that they should exist. (Sorry about that!)

Perhaps binding to a non-existent handler does not produce an exception for some reason?

Anyway, the problem is that LinkDisplay is a subclass of PlinkBase but did not implement those two methods. (Sorry about that, too.)

I pushed a change which corrects the exception message and adds those two methods to LinkDisplay. In the SnapPy app, Link('4a1').view() did not crash with that change.

[NathanDunfield]

@culler: Thanks for fixing this, which I put into PLink 2.4.9 and have uploaded it to PyPI.