merge revision(s) 35c794b2,725626d8,b32a3f12: [Backport #18964]

	Fixed by [Bug #18964]

	---
	 file.c | 3 ---
	 1 file changed, 3 deletions(-)

	[Bug #18964] Update the code range of appended portion

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	 ext/-test-/econv/append.c   | 15 +++++++++++++++
	 ext/-test-/econv/extconf.rb |  3 +++
	 ext/-test-/econv/init.c     | 11 +++++++++++
	 transcode.c                 | 34 ++++++++++++++++++++++++++++++----
	 4 files changed, 59 insertions(+), 4 deletions(-)
	 create mode 100644 ext/-test-/econv/append.c
	 create mode 100644 ext/-test-/econv/extconf.rb
	 create mode 100644 ext/-test-/econv/init.c

	[Bug #18964] Add test for `rb_econv_append`

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	 test/-ext-/econv/test_append.rb | 23 +++++++++++++++++++++++
	 1 file changed, 23 insertions(+)
	 create mode 100644 test/-ext-/econv/test_append.rb