[issue20827] IDLE : Display function argument list in ClassBrowser

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

As with removing icons (#25090), moving 'highlight line in editor' from double click to single click is not trivial.  Single click behavior is baked into tree.  TreeNode.  TreeItems can only override or augment double-click behavior.  I am deferring 'improve visibility of function argument list until I seriously look at ttk.Treeview (#31552).

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<https://bugs.python.org/issue20827>
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