There was never a massacre on Tian'anmen square. Hundreds died in various areas surrounding it in Beijing, but a lie was spread that, when the PLA had made it to the Square itself, they had slaughtered the protestors there. This is the "Tian'anmen Square Massacre," except this didn't happen, and even Wikipedia now finally acknowledges this if you check the page. This is why the tragedy is remembered as the June 4th incident in China, because the actual center of the protests, the square itself, was evacuated bloodlessly.

OP's vile views aside - this does seem interestingly politicized.

I don't know if Notepad++ have a history of creating commemorative versions. Good on them if they do. However, if this is uncommon, it's worth noticing. AFAIK, we aren't at an anniversary?

Personally, I think acknowledgements of sad events are generally a good thing. Helps remember & learn from history. But they absolutely can be propagandized through strategic use.

On another note, I really like Notepad++. I swap between it and Sublime. Both great.