Fix infinite loop when using [ or ] in paths

[nielswitte]

Problem

Using [ and/or ] in a path (directory or filename) will result in an endless loop causing: Maximum call stack size exceeded

Fix

Stop the loop when the matched value is the same as the source value.

Changes

• node/task.ts — Additional if statement added to check if the new src in sourcesToProcess differs from the original source
• node/tests/cp.ts — Test added with [ and ] in directory and filename

Fixes

#1166

[nielswitte]

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