GIMP 2.10.4

What's new in this version:

Core:
- Remove gimp_display_shell_draw_background() and all clipping hacks for drawing the canvas background. This optimizes away one entire step of drawing of image size, for each expose
- Font loading does not block startup anymore. Only consequence is that the Text tool may not be usable immediately if fonts are not fully loaded yet (and will output an appropriate error if you do so). All non-text related activities can be performed right away
- Change of the URL from bugzilla to gitlab where appropriate
- New tool option manager to better keep track of user context and paint options in a consistent manner

User Interface:
- The Dashboard dockable dialog now has a 'Memory' group that shows memory-usage information: the currently used memory size, the available physical memory size, and the total physical memory size. It can also show the tile-cache size, for comparison against the other memory stats. Note that the upper-bound of the meter is the physical memory size, so the memory usage may be over 100% when GIMP uses the swap
- The Dashboard dockable dialog now has "read" and "written" fields in the dashboard swap group, which report the total amount of data read-from/written-to the tile swap, respetively. Additionally, the swap busy indicator (used as the meter's LED) has been improved, so that it's active whenever data has been read-from/written-to the swap during the last sampling interval, rather than at the point of sampling
- Fonts can now be tagged. The user interface is the same as for brushes, patterns etc
- Some icons fixed: larger spacing between broken chains and gimp-tool-ellipse-select made symmetrical

Usability:
- When a plug-in cannot be applied to an image because of mismatch in image types (e.g. layer has no alpha or image is greyscale), GIMP now displays a message listing supported image types for this plug-in.

Tools:
- The Measurement tool now has an "Auto straighten" option allowing to rotate the active drawable (layer, channel…) so that the measurement line is used as horizon. As other transform tools, the feature will work on linked drawables as well
- The Smudge tool now paints correctly on images with a color profile other than the GIMP's built-in one

Build:
- Installer: set compatibility options to run Python plugins in HiDPI-aware mode
- Put back compatibility DLLs for really old plugins
- Install binary tool `gimp-test-clipboard` on the system to allow people to help us debug clipboard bugs
- --enable-bundled-mypaint-brushes renamed --enable-relocatable-bundle and also make WMF fonts looked up on the runtime prefix of GIMP (instead of the build-time path) when this build option was set

Plug-ins:
- gimptool-2.0 binary now accepts source files with non-standard extensions if it can try to guess appropriate language from the compiler being used. It will also properly quote arguments for shell usage
- Run explicitly Python 2 as Python plug-in interpreter to prevent breakage on systems where Python 3 is the default
- raw_input()'s argument in Python console is now optional, and input() support has been added

File Formats:
- The PSD loader now provides an option to load "merged", pre-composited version of the images that becomes available when a PSD file was saved with "Maximize Compatibility" option enabled in Photoshop. This is useful when loading PSD files that use features that GIMP doesn't currently support, and therefore can't render correctly, such as adjustment layers. When loading the merged image version, we avoid loading certain additional data from the file, such as channels, paths, and guides, while still loading metadata. This option is currently exposed as an additional file type ("Photoshop image (merged)"), which has to be explicitly selected from the file-type list when opening the image
- Embedding GIMP's built-in sRGB color profile to exported files is now optional. The default choice can be set in the Preferences dialog

Translations:
- Updated translations: Catalan, Czech, Danish, Dutch, Finnish, Greek, Hungarian, Italian, Latvian, Polish, Romanian, Russian, Spanish, Swedish, Ukrainian