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to not fail on mouseless tty.

check also whether last-command is one of mouse-save-then-kill,
mouse-secondary-save-then-kill, mouse-set-region, mouse-drag-region.

enabled and the current command is self-insert-command, call it
explicitly with overwrite-mode bound to nil, to not allow it
to delete the character after the selected region.

to take advantage of region handling in `insert-pair' function.
Suggested by Stephan Stahl <stahl@eos.franken.de>

file-supersession errors to interact properly with userlock.el.

to `ignore' if the region is empty.

(insert-parentheses): Add 'delete-selection property.
(delete-selection-pre-hook): Simplify slightly.

At the end of the file, test this variable, and turn on the mode
if it is non-nil.

Don't explicitly check the value and call delete-selection-mode.
Don't put on a custom-loads property.

(yank): Use `yank' as delete-selection property.

(keyboard-quit): Definition deleted.
(minibuffer-keyboard-quit): If Delete Selection mode is off,
do abort even if mark is active.

Functions and variables renamed to ...delete-selection...
from ...pending-delete...
Bind all minibuffer keymaps alike.