Issue #21523: Fix over-pessimistic computation of the stack effect of some opcodes in the compiler.

This also fixes a quadratic compilation time issue noticeable when compiling
code with a large number of "and" and "or" operators.
Issue #21523: Fix over-pessimistic computation of the stack effect of some opcodes in the compiler.

This also fixes a quadratic compilation time issue noticeable when compiling
code with a large number of "and" and "or" operators.
Issue #21522: Added Tkinter tests for Listbox.itemconfigure(),
PanedWindow.paneconfigure(), and Menu.entryconfigure().
Issue #21522: Added Tkinter tests for Listbox.itemconfigure(),
PanedWindow.paneconfigure(), and Menu.entryconfigure().