The accessibility bridge code that exports accessible objects on the bus is now used by default; atk-bridge has been converted into a library that GTK+ links against. To void the linking, pass --without-atk-bridge when configuring GTK+.
GTK+ now follows the XDG Base Directory specification for user configuration and data files. In detail,
- $XDG_CONFIG_HOME/gtk-3.0/custom-papers is the new location for $HOME/.gtk-custom-papers
- $XDG_CONFIG_HOME/gtk-3.0/bookmarks is the new location for $HOME/.gtk-bookmarks
- $XDG_DATA_HOME/themes is preferred over $HOME/.themes
- $XDG_DATA_HOME/icons is preferred over $HOME/.icons.
Existing files from the old location will still be read if the new location does not exist.
$HOME/.gtk-3.0 is no longer in the default module load path. If you want to load modules from there, add it to the GTK_PATH environment variable.