1.4.0-rc.1+mc26.1

Changes:

When you switch mappings, and your previous mappings fail to load, the previously active mappings will be used instead of always switching to default mappings. This comes with other stability & robustness improvements to mappings switching.
Added a /navmappings debug dumpMappingsState sub-command.
Added a hard-coded warning that the builtin mappings emacs_mac, emacs_windows_linux, and readline are incomplete & not fully accurate emulates of those pieces of software.
Added a verbose logging mode which promotes TRACE/DEBUG level logs to INFO for inclusion in latest.log in all environments (especially for the vanilla launcher) for easier bug reports. This mode is only enabled if the cmd_delete.allowVerboseLogs JVM argument is set to true.
Fixed a crash that would occur when exporting or importing sharecodes on Minecraft 26.1.2 or earlier (#24).
Fixed a bug where exporting builtin mappings' sharecodes would not work outside of a development environment.
Fixed a bug where custom mappings JSONs that inherited nothing wouldn't load.
Added support for forcing CMD + Delete not to crash Minecraft on certain fatal exceptions by setting the cmd_delete.forcePreventMinecraftCrashes JVM argument to true. Note that this may allow for undefined behavior and/or illegal states after certain types of failures, so this mode is not recommended for normal use.
Internal code improvements.

CMD + Delete