Could anybody in short explain, what I have to understand from “it’s tagged”?
Git is the most popular version control system, which lets developers track changes to software source code. A “tag” applies a name (or version number) to a specific point in the history.
The commit shows that there was a longer with 3.0.0 tag before and now its just 3.0.0
The link goes to a commit which is tagged GIMP_3_0_0, and shows the change made in this commit. This commit happens to change the version line in a file called meson.build - this file configures Meson, which is used to build GIMP. The version is being changed from 3.0.0-RC3+git to 3.0.0. The string “RC3” in the previous version number is short for “release candidate 3”, and “git” here means that there were additional changes since “release candidate 3” was released.
What does that tell us? :D
So far the news and downloads pages still haven’t been updated, but the version being changed to 3.0.0 and this commit being tagged tells us that GIMP 3.0.0 is about to be released: official binaries and an announcement about it can be expected to appear very soon.
The tag means no more changes will be included in 3.0.0; if some show-stopping bug were discovered now, the version number would be incremented to 3.0.1 rather than to include a fix in 3.0.0. (Technically, a tag can be updated/replaced, but by convention it is not.)
as i said, it “is about to be released”.
or, one could also say that the the 3.0.0 source code has been released, but the official binaries haven’t been yet :)
edit: i see https://flathub.org/apps/org.gimp.GIMP has 3.0.0 now, and from https://testing.gimp.org/downloads/ i see that https://download.gimp.org/gimp/v3.0/linux/GIMP-3.0.0-x86_64.AppImage is also there. presumably https://www.gimp.org/downloads/ will be updated very soon.