Users report an issue where triple-click text selection fails in replies on Chromium browsers (Linux and macOS), but works in Firefox and the original post. Saif first noticed the problem, with Sam confirming it’s reproducible on Chromium Linux. supermathie notes the text is briefly selected but then unselected, and the clipboard captures the text with extra formatting. Andrew_Rowe confirms the issue is limited to replies, not the original post. Don identifies user-select: none on .post-controls as the cause, suggesting it should only apply to touchscreens. saquetim confirms a fix is in progress with a PR (#30628), though it may take a few days to deploy.
Not sure if this is exactly related but I wanted to point out
notice that I am unable to select the text in the sentence unless I manually select it all, this was never the case till somewhat recently. This behavior is sometimes reproducible
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'Triple click on last paragraph on Chromium Linux is selecting and then unselecting the text.\n\n4\n\n\u200b\n\u200b\n\nReply\n'