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Adds line numbers to code blocks on Stack Overflow (if they have more than 5 lines)

This script will read all code entries on the page, and create line numbering for them. It will be hidden by default, but can be toggled using the #L button that gets added in the top right.

Some click combos are available for the #L toggle button:

Click : Toggle this code block’s line nums

CTRL + Click : Remove the toggle button and line nums from this code block

SHIFT + Click : Toggle line nums on all code blocks (to the same state)

SHIFT + CTRL + Click : Remove line nums from all code blocks

(Removal is not persistent and everything is reset on page reload)