parkhojeong opened a new pull request, #66221:
URL: https://github.com/apache/airflow/pull/66221
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When manually selecting and copying text from the Rendered Templates tab,
the pasted result contained an extra blank line . The copy button is
unaffected.
- bug video
https://github.com/user-attachments/assets/ce494b8d-15ca-42c5-80b5-95303b2dc42b
## Root cause
During clipboard serialization, browsers reconstruct the copied text from
that flex-based DOM structure rather than from the original source string,
which can introduce unwanted line breaks and spacing in the pasted result.
```js
// react-syntax-highlighter/src/highlight.js
if (wrapLongLines & showLineNumbers) {
properties.style = { display: 'flex', ...properties.style };
}
```
## Fix
Replacing the per-line flex layout with a plain block layout makes the
rendered lines serialize more predictably during copy/paste, preserving the
expected text structure.
- fixed video
https://github.com/user-attachments/assets/5d32467f-c150-4afa-96fa-f4f1b23162b3
* closes: #66143
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