Ruby indented heredoc styles final newline character as delimiter, not heredoc

[nyamatongwe]

In this example, the first item is a standard heredoc and the second is an indented heredoc because of the - although it is not actually indented.

<<T
X
T

<<-T
X
T

The content line is X\n or X\r\n. Ruby defines that a heredoc includes the ending newline.
https://ruby-doc.org/core-2.3.1/doc/syntax/literals_rdoc.html#label-Here+Documents

The lexer correctly styles the \n for the standard heredoc as SCE_RB_HERE_Q but as SCE_RB_HERE_DELIM for the indented heredoc. This causes incorrect visuals when line ends are visible or an eolfilled style is specified. It also causes \r and \n to be styled differently causing problems with the automated tests.

This can be fixed with

diff --git a/lexers/LexRuby.cxx b/lexers/LexRuby.cxx
index b1bebb34..0fc04707 100644
--- a/lexers/LexRuby.cxx
+++ b/lexers/LexRuby.cxx
@@ -1321,7 +1321,7 @@ static void ColouriseRbDoc(Sci_PositionU startPos, Sci_Position length, int init
                                                 i - HereDoc.DelimiterLength + 1,
                                                 lengthDoc,
                                                 HereDoc.Delimiter)) {
-                styler.ColourTo(i - 1 - HereDoc.DelimiterLength, state);
+                styler.ColourTo(i - HereDoc.DelimiterLength, state);
                 styler.ColourTo(i, SCE_RB_HERE_DELIM);
                 state = SCE_RB_DEFAULT;
                 preferRE = false;

[zufuliu]

Good catch.

[nyamatongwe]

Committed fix.