patch 8.1.2181: highlighting wrong when item follows tab

Problem:    Highlighting wrong when item follows tab.
Solution:   Don't use syntax attribute when n_extra is non-zero.
            (Christian Brabandt, closes #5076)

src/drawline.c

@@ -1399,14 +1399,14 @@ win_line(
 	    }
 #endif
 
-	    if (extra_check)
+#ifdef FEAT_SYN_HL
+	    syntax_attr = 0;
+	    if (extra_check && n_extra == 0)
 	    {
 # ifdef FEAT_TERMINAL
 		if (get_term_attr)
 		    syntax_attr = term_get_attr(wp->w_buffer, lnum, vcol);
 # endif
-
-#ifdef FEAT_SYN_HL
 		// Get syntax attribute.
 		if (has_syntax)
 		{
@@ -1463,8 +1463,8 @@ win_line(
 			syntax_flags = get_syntax_info(&syntax_seqnr);
 # endif
 		}
-#endif
 	    }
+#endif
 
 	    // Decide which of the highlight attributes to use.
 	    attr_pri = TRUE;
@@ -1502,7 +1502,7 @@ win_line(
 		// Use line_attr when not in the Visual or 'incsearch' area
 		// (area_attr may be 0 when "noinvcur" is set).
 # ifdef FEAT_SYN_HL
-		if (has_syntax)
+		if (syntax_attr != 0)
 		    char_attr = hl_combine_attr(syntax_attr, line_attr);
 		else
 # endif
@@ -1531,15 +1531,10 @@ win_line(
 		else
 #endif
 #ifdef FEAT_SYN_HL
-		    if (has_syntax
-# ifdef FEAT_TERMINAL
-			    || get_term_attr
-# endif
-		       )
 		    char_attr = syntax_attr;
-		else
-#endif
+#else
 		    char_attr = 0;
+#endif
 	    }
 	}
 	if (char_attr == 0)

src/feature.h

@@ -429,18 +429,6 @@
 # define FEAT_CONCEAL
 #endif
 
-/*
- * +textprop		Text properties and popup windows
- */
-#if defined(FEAT_EVAL) && defined(FEAT_SYN_HL)
-# define FEAT_TEXT_PROP
-#endif
-
-#if defined(FEAT_SYN_HL) && defined(FEAT_RELTIME)
-// Can limit syntax highlight time to 'redrawtime'.
-# define SYN_TIME_LIMIT 1
-#endif
-
 /*
  * +spell		spell checking
  *
@@ -1119,10 +1107,6 @@
 # define FEAT_ARP
 #endif
 
-/*
- * +GUI_Athena		To compile Vim with or without the GUI (gvim) you have
- * +GUI_Motif		to edit the Makefile.
- */
 
 /*
  * +ole			Win32 OLE automation: Use Makefile.ovc.
@@ -1138,6 +1122,8 @@
  * +tcl			TCL interface: "--enable-tclinterp"
  * +netbeans_intg	Netbeans integration
  * +channel		Inter process communication
+ * +GUI_Athena		Athena GUI
+ * +GUI_Motif		Motif GUI
  */
 
 /*
@@ -1170,6 +1156,23 @@
 #if defined(FEAT_TERMINAL) && !defined(CURSOR_SHAPE)
 # define CURSOR_SHAPE
 #endif
+#if defined(FEAT_TERMINAL) && !defined(FEAT_SYN_HL)
+// simplify the code a bit by enabling +syntax when +terminal is enabled
+# define FEAT_SYN_HL
+#endif
+
+/*
+ * +textprop		Text properties and popup windows
+ */
+#if defined(FEAT_EVAL) && defined(FEAT_SYN_HL)
+# define FEAT_TEXT_PROP
+#endif
+
+#if defined(FEAT_SYN_HL) && defined(FEAT_RELTIME)
+// Can limit syntax highlight time to 'redrawtime'.
+# define SYN_TIME_LIMIT 1
+#endif
+
 
 /*
  * +signs		Allow signs to be displayed to the left of text lines.

src/testdir/dumps/Test_syntax_c_01.dump

@@ -12,9 +12,11 @@
 |}| @73
 @3|s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&@60
 |m|y|F|u|n|c|t|i|o|n|(|c+0#00e0003&|o|n|s|t| +0#0000000&|d+0#00e0003&|o|u|b|l|e| +0#0000000&|c|o|u|n|t|,| |s+0#00e0003&|t|r|u|c|t| +0#0000000&|n|o|t|h|i|n|g|,| |l+0#00e0003&|o|n|g| +0#0000000&|t|h|e|r|e|)| |{| @14
-@1| +0#0000e05&@6|/@1| |1+0#e000002&|2|3|:+0#0000e05&| |n|o|t|h|i|n|g| |t|o| |e+0&#ffff4012|n|d|i|f| +0&#ffffff0|h|e|r|e| +0#0000000&@37
-@1| +0#af5f00255&@6|f|o|r| +0#0000000&|(|i+0#00e0003&|n|t| +0#0000000&|i| |=| |0+0#e000002&|;+0#0000000&| |i| |<| |c|o|u|n|t|;| |+@1|i|)| |{| @33
+@8|/+0#0000e05&@1| |1+0#e000002&|2|3|:+0#0000e05&| |n|o|t|h|i|n|g| |t|o| |e+0&#ffff4012|n|d|i|f| +0&#ffffff0|h|e|r|e| +0#0000000&@37
+@8|f+0#af5f00255&|o|r| +0#0000000&|(|i+0#00e0003&|n|t| +0#0000000&|i| |=| |0+0#e000002&|;+0#0000000&| |i| |<| |c|o|u|n|t|;| |+@1|i|)| |{| @33
 @11|b+0#af5f00255&|r|e|a|k|;+0#0000000&| @57
 @8|}| @65
+@8|N+0&#ffff4012|o|t|e|:+0&#ffffff0| |a|s|d|f| @56
 |}| @73
-|-+2&&@1| |V|I|S|U|A|L| |-@1| +0&&@34|2| @8|1|0|,|3|7| @8|A|l@1| 
+|~+0#4040ff13&| @73
+|-+2#0000000&@1| |V|I|S|U|A|L| |-@1| +0&&@34|2| @8|1|0|,|3|7| @8|A|l@1| 

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2181,
 /**/
     2180,
 /**/