top of the window, unless it is too near the bottom to do do.

affected by a tk regression.  Initial patch by Mark Roseman.

now work on Mac Aqua.  Patch by Mark Roseman.

make opening brace of container literals and comprehensions correspond to the line number and col offset of the AST node (closes #25131)

This associates the message box with the widget and is better for Mac OSX.
Patch by Mark Roseman.

Some of the calls to the Frm class were buggy anyway.

The height is reduced by 3/4 to account for extra spacing between lines,
relative to an Idle editor, and extra tall header lines.

by adding a new tag.  Patch by Mark Roseman. Also give <pre> text a very
light blueish-gray background similar to that used by Sphinx html.

Patch by Benjamin Hodgson.