Problem

When copying all the text from the code block macro

• It doesn't maintain the code structure, and when pasting, it becomes a single line, as you have experienced.
• The code structure shows correctly in edit mode, but when viewing the code, it can be a single line when it's within another macro. 

Environment

Confluence Cloud with legacy editor

Steps to Reproduce

• Create a legacy page
• Insert a code block macro
• Enter multi-line code into the macro
• Publish the page
• Edit the page
• Copy the text from the code block macro 
• Paste to another application or another page

Expected Results

The copied text maintains the multi-line code formatting 

Actual Results

The copied text lost code formatting and becomes a single line

Workaround

Select and copy the whole code block macro instead of the text within the macro 

Notes