In days of old, it was safe to use -brand-short-name for this, as it always lined up with the installer's concept of BrandShortName. This changed when https://bugzilla.mozilla.org/show_bug.cgi?id=1378834 landed -- which started using "Firefox Nightly" for the nightly branding BrandShortName in the installer (but maintained "Nightly" as the in-product -brand-short-name). Changing one or the other of these is not really a viable option:
- Changing the installer's BrandShortName for Nightly to match -brand-short-name would cause shortcuts to simply be called "Nightly" -- which is the opposite of what the aforementioned bug wanted
- Changing -brand-short-name would cause a number of in-product strings to start using "Firefox Nightly" instead of "Nightly" -- which is probably undesirable for a few reasons, not the least of which is possible l10n implications
For these reasons, and the relatively short timeline I have to fix this, I'm taking the simplest and easiest path of introducing a new string specifically for in-product shortcut names, which lines up with the installer's values for BrandShortName. (We perhaps should also separate this out in the installer -- but it's unnecessary here, so I did not go to the trouble.)
Differential Revision: https://phabricator.services.mozilla.com/D156991