Once you've accepted entrusting Google with almost the whole bunch of your digital tools, among which your mail managing... hey, keep on reading, I was just kidding ;-|
Starting from scratch : here's a Google Mail feature that's likely to both save your time and spare your eyes...
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"[...] copying an entire chain of messages after your reply doesn't make any sense when people can scroll down to see all the messages, chained one after the other. [...] only provide the snippet that you are actually replying to. [and...] boom! Only the selected text will be quoted. Reply at will. [...]"