Development release GIMP 2.99.2 is out - GIMP
The new unstable version of GIMP , 2.99.2, marks the first step towards GIMP 3 based on the GTK3 user interface toolkit.
The first difference will be visual as you will notice that GIMP got a bit more of a modern look and it can also use some new widgets (instead of redeveloping them on GTK2 ) as well as client-side window decorations on various dialogs. But the aesthetic differences are far from being the main appeal of GTK3 .
One of the main issues of GTK2 was the absent support for high pixel density displays (e.g. small screens with high resolution or big screens with extremely high resolution) which has become more widespread, especially among graphics professionals. GIMP 2.10 came with partial workaround which was acceptable only in some limited cases but was not really appropriate for intense use of the software.
By “input device”, we are mostly talking about drawing tablets or pen displays. In GIMP 2, their support had many shortcomings: you had to plug the tablet before starting GIMP , enable each new device explicitly in the settings and, worse, unplugging the tablet could lead to instability of the software (though this issue got mostly worked around on GTK2 by GIMP developers in the v2.8 release series).
