A new version of the GIMP AppImage is available for download. The main difference with the previous ones is that it now enabled most of the optional GIMP features:
Optional Features: Levin matting engine: yes Language selection: yes Vector icons: yes Dr. Mingw (Win32): no Relocatable bundle: no Default ICC directory: /usr/share/color/icc Debug console (Win32): no 32-bit DLL folder (Win32): no Detailed backtraces: yes Optional Plug-Ins: Ascii Art: no (AA library not found) Ghostscript: yes Help Browser: no (WebKit not found) JPEG 2000: yes MNG: yes OpenEXR: yes WebP: yes Heif: yes PDF (export): yes Print: yes Python 2: yes TWAIN (Win32): no Webpage: no (WebKit not found) WMF: yes X11 Mouse Cursor: yes XPM: yes Email: needs runtime dependency: xdg-email Optional Modules: ALSA (MIDI Input): no (libasound not found or unusable) Linux Input: yes (GUdev support: no (libgudev not found)) DirectInput (Win32): no
One known issue, on which I am working at the moment, is internationalisations support, which seems to be broken.
As usual, the up-to-date packages can be downloaded from https://github.com/aferrero2707/gimp-appimage/releases.