delete-options: preference variable

Default value: 0

Bits in this variable controls optional behavior in deleting and killing commands. Normally, if a command that deletes single characters, like the one on <Backspace> or <Del>, follows a command that puts text on the kill ring, the additional characters will be added to the kill ring. The 1 bit prevents that; the characters will simply be deleted. With a numeric argument, these commands delete many characters at once; in that case they always put their text on the kill ring.

More info:

Inserting and Deleting

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delete-hacking-tabs Variable Reference detect-encodings