Issue #2615916 by dakku, yukare: fatal Error. geshifilter.inc missing Drupal 8 RC4
Issue #2592539 by yukare: Link substitution at hook_install()s message does not work. Fix for the tests.
Issue #2592539 by fl3a: Link substitution at hook_install()s message does not work
Issue #2615518: Fix coding standart. This was missing from last commit in this issue. None error or warning in coder now.
Issue #2615520 by yukare: Remove empty files
Issue #2615518 by yukare: Fix coding standart
Issue #2592281 by fl3a: Link substitution at Geshi settings Page does not work
Issue #2605994 by yukare: t() now return an object, not a string.
Issue #2555989 by yukare: Configuration schemas missing langcode
Issue #2530384 by yukare: Call to undefined FilterProcessResult::setAssets()
Issue #2501959 by alex43210, gokulnk, yukare: In version from beta10 class String removed, so it's need to use SafeMarkup class
Issue #2422511 by yukare: Configuration objects by default are immutable.
Issue #2353213 by yukare: Fix hook_help
Issue #2395617 by yukare: Setting default_highlighting have the wrong default value
Issue #2395791 by yukare: All css must use libraries
Issue #2395595 by yukare: Fix schema for config
Issue #2395553 by yukare: Update form callbacks.
Issue #2375955 by yukare: default_highlighting selection is broken.
Issue #2373625 by grendzy: default_highlighting should be string, not integer.
Issue #2374931 by kdechant: Call to removed function decode_entities() should be replaced.
Issue #1751286 by yukare: Saving selected languages under text formats doesn't work
Issue #2161119 by yukare: Fatal error in tests: Call to undefined function db_result()
Issue #2047021 by yukare, yrocq: Special chars are html entities in highlighted code.
Issue #2354875 by yukare: Provide a filter for files. This still need more work.
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