[#21] added configuration to switch off counting double-width Asian c…

…haracters as two characters for line-breaking purposes.

Closes #21

RELEASE-NOTES.md

@@ -36,6 +36,7 @@ If those characters are treated to have the same width as other characters, the
 
 From this release, picocli will use 2 columns for these wide characters when calculating where to put line breaks, resulting in better usage help message text.
 
+This can be switched off with `CommandLine.setAdjustLineBreaksForWideCJKCharacters(false)`.
 
 ## <a name="4.0.0-alpha-2-fixes"></a> Fixed issues
 - [#495] Publish picocli as a JPMS module in a new artifact `picocli-core-module`. Thanks to [Warkdev](https://github.com/Warkdev) for the pull request. 

picocli-examples/src/main/java/picocli/examples/customhelp/ShowAll.java

@@ -57,6 +57,7 @@ public String render(Help help) {
         TextTable textTable = TextTable.forColumns(help.ansi(),
                 new Column(15, 2, Overflow.SPAN),
                 new Column(spec.usageMessage().width() - 15, 2, Overflow.WRAP));
+        textTable.setAdjustLineBreaksForWideCJKCharacters(spec.usageMessage().adjustLineBreaksForWideCJKCharacters());
 
         for (CommandLine subcommand : spec.subcommands().values()) {
             addHierarchy(subcommand, textTable, "");