Add some torture tests for Unicode support

These are a set of specially-crafted text files designed to exercise
most of the corner cases in the Unicode support code, particularly
FullUnicodeLine.setChar()'s support for overwriting screen columns with
changes in sequence lengths and display widths.  For best (worst?)
results, use the tests in vttest mode; the lines of exactly 80 columns
will be more likely to uncover bugs that way.

tests/controlSequences/combiningCharReplacement.txt

@@ -0,0 +1,10 @@
+Overwriting a letter with combining diacritic with a letter without in an
+80-column line:
+
+xxxxxMu[combining diaeresis]nchenxxx[...] ESC [ 7 G u:
+xxxxxMünchenxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxu
+
+Overwriting a letter without combining diacritic with a letter with combining diacritic in an 80-column line:
+
+xxxxMunchenxxx[...] ESC [ 6 G u [combining diaeresis]:
+xxxxMunchenxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxü

tests/wideChars/combining-chars.txt

@@ -0,0 +1,57 @@
+East Asian wide characters with combining diacritics:
+
+中文 [combining low line]:
+中文̲
+
+xxx中[combining low line]文:
+xxx中̲文
+
+Overwriting an East Asian wide character with combining diacritic with an East
+Asian wide character without combining diacritic, in the middle of an 80-column
+line with mixed narrow and wide chars:
+
+xxx[...]xxx中文[combining low line]xxx[...]xxx你好ESC [ 23 G 国:
+xxxxxxxxxxxxxxxxxxxx中文̲xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好国
+
+xxx[...]xxx中文[combining low line]。xxx[...]xxx你好xESC [ 23 G 国:
+xxxxxxxxxxxxxxxxxxxx中文̲。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x国
+
+Overwriting an East Asian wide character with another one with a combining
+diacritic, in the middle of an 80-column line with mixed narrow and wide chars:
+
+xxx[...]xxx中文xxx[...]xxx你好ESC [ 23 G 国[combining low line]:
+xxxxxxxxxxxxxxxxxxxx中文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好国̲
+
+xxx[...]xxx中文。xxx[...]xxx你好xESC [ 23 G 国[combining low line]:
+xxxxxxxxxxxxxxxxxxxx中文。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x国̲
+
+Overwriting a narrow character with an East Asian wide character with a
+combining diacritic, in the middle of an 80-column line with mixed narrow and
+wide chars:
+
+xxx[...]xxx中文xxx[...]xxx你好xESC [ 25 G 。[combining low line]:
+xxxxxxxxxxxxxxxxxxxx中文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x。̲
+
+xxx[...]xxx中y文xxx[...]xxx你好ESC [ 23 G ，[combining low line]:
+xxxxxxxxxxxxxxxxxxxx中y文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好，̲
+
+Overwriting a narrow character with a combining diacritic with an East Asian
+wide character, in the middle of an 80-column line with mixed narrow and
+widechars:
+
+xxxxxxxxàxxx[...]xxx中文xxx[...]xxx你好xESC [ 9 G 中:
+xxxxxxxxàxxxxxxxxxxx中文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x中
+
+xxxxxxxxàxxx[...]xxx中文xxx[...]xxx你好xESC [ 8 G 中:
+xxxxxxxxàxxxxxxxxxxx中文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x中
+
+Overwriting an East Asian wide character with combining diacritic with a narrow
+character without combining diacritic, in the middle of an 80-column line with
+mixed narrow and wide chars:
+
+xxx[...]xxx中文[combining low line]xxx[...]xxx你好ESC [ 23 G y:
+xxxxxxxxxxxxxxxxxxxx中文̲xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好y
+
+xxx[...]xxx中文[combining low line]。xxx[...]xxx你好xESC [ 23 G y:
+xxxxxxxxxxxxxxxxxxxx中文̲。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好xy
+

tests/wideChars/last-column-wrapping.txt

@@ -0,0 +1,4 @@
+A line taking 81 screen columns, with an East Asian wide character at column 79
+(should be truncated or wrapped on an 80-column terminal):
+
+xxxxxxxxxxxxxxxxxxxx中文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好

tests/wideChars/linkification.txt

@@ -0,0 +1,6 @@
+A link on a line with East Asian wide characters:
+中国国际航空公司 http://www.airchina.com/
+
+A link on a long line with East Asian wide characters (the link should be
+wrapped across two lines on an 80-column terminal):
+xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 中国国际航空公司 http://www.airchina.com/

tests/wideChars/overwriting1.txt

@@ -0,0 +1,16 @@
+Overwriting an East Asian wide character with another one:
+
+中国 ESC [ 2 D 文:
+中国文
+
+xxx中文 ESC [ 2 D 国:
+xxx中文国
+
+Overwriting an East Asian wide character with another one, in the middle of
+an 80-column line with mixed narrow and wide chars:
+
+xxx[...]xxx中文xxx[...]xxx你好ESC [ 23 G 国:
+xxxxxxxxxxxxxxxxxxxx中文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好国
+
+xxx[...]xxx中文。xxx[...]xxx你好xESC [ 23 G 国:
+xxxxxxxxxxxxxxxxxxxx中文。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x国

tests/wideChars/overwriting2.txt

@@ -0,0 +1,16 @@
+Inserting an East Asian wide character into the middle of another one:
+
+中国 ESC [ D 文:
+中国文
+
+xxx中文 ESC [ D 国:
+xxx中文国
+
+Inserting an East Asian wide character into the middle of another one, in the
+middle of an 80-column line with mixed narrow and wide chars:
+
+xxx[...]xxx中文xxx[...]xxx你好xESC [ 24 G 国:
+xxxxxxxxxxxxxxxxxxxx中文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x国
+
+xxx[...]xxx中文。xxx[...]xxx你好ESC [ 24 G 国:
+xxxxxxxxxxxxxxxxxxxx中文。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好国

tests/wideChars/overwriting3.txt

@@ -0,0 +1,16 @@
+Overwriting an East Asian wide character with a narrow character:
+
+中国 ESC [ 2 D x:
+中国x
+
+xxx中文 ESC [ 2 D x:
+xxx中文x
+
+Overwriting an East Asian wide character with a narrow character, in the middle
+of an 80-column line with mixed narrow and wide chars:
+
+xxx[...]xxx中文xxx[...]xxx你好xESC [ 23 G y:
+xxxxxxxxxxxxxxxxxxxx中文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好xy
+
+xxx[...]xxx中文。xxx[...]xxx你好ESC [ 23 G y:
+xxxxxxxxxxxxxxxxxxxx中文。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好y

tests/wideChars/overwriting4.txt

@@ -0,0 +1,16 @@
+Overwriting a narrow character with an East Asian wide character:
+
+xxx ESC [ D 中:
+xxx中
+
+xxx ESC [ 3 D 中:
+xxx中
+
+Overwriting a narrow character with an East Asian wide character, in the middle
+of an 80-column line with mixed narrow and wide chars:
+
+xxx[...]xxx中文xxx[...]xxx你好xESC [ 25 G 版:
+xxxxxxxxxxxxxxxxxxxx中文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x版
+
+xxx[...]xxx中文y。xxx[...]xxx你好ESC [ 25 G 版:
+xxxxxxxxxxxxxxxxxxxx中文y。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好版

tests/wideChars/overwriting5.txt

@@ -0,0 +1,16 @@
+Inserting a narrow character into the middle of an East Asian wide character:
+
+中国 ESC [ D x:
+中国x
+
+xxx中文 ESC [ D x:
+xxx中文x
+
+Inserting a narrow character into the middle of an East Asian wide character,
+in the middle of an 80-column line with mixed narrow and wide chars:
+
+xxx[...]xxx中文xxx[...]xxx你好xESC [ 24 G y:
+xxxxxxxxxxxxxxxxxxxx中文xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好xy
+
+xxx[...]xxx中文。xxx[...]xxx你好ESC [ 24 G y:
+xxxxxxxxxxxxxxxxxxxx中文。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好y

tests/wideChars/sip-chars.txt

@@ -0,0 +1,100 @@
+East Asian wide characters in the Supplementary Ideographic Plane (thanks to
+http://www.i18nguy.com/unicode/supplementary-test.html):
+
+𠜎𠜱𠝹𠱓𠱸
+
+Mixed East Asian wide characters from the BMP and SIP:
+
+中文：𠜎𠜱，你好，𠝹国。
+𠱸，中文：你好，𠝹国。
+
+Narrow characters and mixed east Asian wide characters from the BMP and SIP, in
+an 80-column line:
+xxxxxxxxxx中文:𠜎𠜱，你好，xx𠝹国。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好xxxxxxxxxx
+xxxxxxxxxx𠱸,中文：你xx好，𠝹国。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx好
+
+Overwriting an East Asian wide character from the SIP with a narrow character:
+
+中文：𠜎 ESC [ 2 D x:
+中文：𠜎x
+
+xxx中文：𠜎 ESC [ 2 D x:
+xxx中文：𠜎x
+
+Overwriting an East Asian wide character from the SIP with a narrow character,
+in the middle of an 80-column line with mixed narrow and wide chars:
+
+xxx[...]xxx中文：𠜎xxx[...]xxx你好xESC [ 27 G y:
+xxxxxxxxxxxxxxxxxxxx中文：𠜎xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好xy
+
+xxx[...]xxx中文：𠜎。xxx[...]xxx你好ESC [ 27 G y:
+xxxxxxxxxxxxxxxxxxxx中文：𠜎。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好y
+
+Overwriting an East Asian wide character from the SIP with an East Asian wide
+character from the BMP:
+
+中文：𠜎 ESC [ 2 D 国:
+中文：𠜎国
+
+xxx中文：𠜎 ESC [ 2 D 国:
+xxx中文：𠜎国
+
+Overwriting an East Asian wide character from the SIP with an East Asian wide
+character from the BMP in the middle of an 80-column line with mixed narrow and
+wide chars:
+
+xxx[...]xxx中文：𠜎xxx[...]xxx你好xESC [ 27 G 国:
+xxxxxxxxxxxxxxxxxxxx中文：𠜎xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x国
+
+xxx[...]xxx中文：𠜎。xxx[...]xxx你好ESC [ 27 G 国:
+xxxxxxxxxxxxxxxxxxxx中文：𠜎。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好国
+
+Overwriting an East Asian wide character from the BMP with an East Asian wide
+character from the SIP:
+
+中文：国 ESC [ 2 D 𠜎:
+中文：国𠜎
+
+xxx中文：国 ESC [ 2 D 𠜎:
+xxx中文：国𠜎
+
+Overwriting an East Asian wide character from the BMP with an East Asian wide
+character from the SIP in the middle of an 80-column line with mixed narrow and
+wide chars:
+
+xxx[...]xxx中文：国xxx[...]xxx你好xESC [ 27 G 𠜎:
+xxxxxxxxxxxxxxxxxxxx中文：国xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x𠜎
+
+xxx[...]xxx中文：国。xxx[...]xxx你好ESC [ 27 G 𠜎:
+xxxxxxxxxxxxxxxxxxxx中文：国。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好𠜎
+
+Inserting a narrow character into the middle of an East Asian wide character
+from the SIP in the middle of an 80-column line with mixed narrow and wide
+chars:
+
+xxx[...]xxx中文：𠜎xxx[...]xxx你好xESC [ 28 G y:
+xxxxxxxxxxxxxxxxxxxx中文：𠜎xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好xy
+
+xxx[...]xxx中文：𠜎。xxx[...]xxx你好ESC [ 28 G y:
+xxxxxxxxxxxxxxxxxxxx中文：𠜎。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好y
+
+Inserting an East Asian wide character from the SIP into the middle of an East
+Asian wide character from the BMP in the middle of an 80-column line with mixed
+narrow and wide chars:
+
+xxx[...]xxx中文：国xxx[...]xxx你好xESC [ 28 G 𠜎:
+xxxxxxxxxxxxxxxxxxxx中文：国xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x𠜎
+
+xxx[...]xxx中文：国。xxx[...]xxx你好ESC [ 28 G 𠜎:
+xxxxxxxxxxxxxxxxxxxx中文：国。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好𠜎
+
+Inserting an East Asian wide character from the BMP into the middle of an East
+Asian wide character from the SIP in the middle of an 80-column line with mixed
+narrow and wide chars:
+
+xxx[...]xxx中文：𠜎xxx[...]xxx你好xESC [ 28 G 国:
+xxxxxxxxxxxxxxxxxxxx中文：𠜎xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好x国
+
+xxx[...]xxx中文：𠜎。xxx[...]xxx你好ESC [ 28 G 国:
+xxxxxxxxxxxxxxxxxxxx中文：𠜎。xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx你好国
+