Clicking on the general border would not do anything. Clicking on the label at the top (optimally, only the blue underlined part) would take me to the download page.
Clicking anywhere on the border opens the download link to for the native launcher (https://launcher.mojang.com/download/MinecraftInstaller.msi), regardless of if it's part of the label text or just a random part of the border. This also includes clicking on the few pixels between the button and the changelog (which is why I even noticed this).
See the following from the attached image:
I expected clicking at point A to open the link, and clicking at points B or C to do nothing (as it did in previous versions).
In practice, clicking at point A, B, or C all open the link.
This is a minimal-importance bug; it just seems like unintended behavior worth reporting.
Currently tracked here since selectable launcher versions here in Mojira are not always up to date