Testing version: Latest stable GA version
What were you doing: Pasting multi-line text into a callout section
What feature did you use: Callouts
What happened: After the first line, the remaining lines spilled over outside of the callouts section. This resulted in repeatedly copy-pasting each line into the callouts one by one.
What did you expect to happen: All the lines should be included into the callouts section at once.
This how the editors works also in the context of block quotes but We are wondering if what you propose is more inline with the expectations of everybody when it comes to multiline pasting.
At least the code block with (```) honours the multi-line and makes sure to add all lines within the section. Callouts generally look more like an important parah. which can have multiple lines. Hence, having that pasting capability will really help.
Oh yes, it is! 
(The rest is to achieve at least 20 characters)