patch 8.2.3700: text property highlighting continues over breakindent

Problem:    Text property highlighting continues over breakindent.
Solution:   Stop before the end column. (closes #9242)

src/drawline.c

@@ -265,6 +265,9 @@ win_line(
     int		c_extra = NUL;		// extra chars, all the same
     int		c_final = NUL;		// final char, mandatory if set
     int		extra_attr = 0;		// attributes when n_extra != 0
+#ifdef FEAT_LINEBREAK
+    int		in_linebreak = FALSE;	// n_extra set for showing linebreak
+#endif
     static char_u *at_end_str = (char_u *)""; // used for p_extra when
 					// displaying eol at end-of-line
     int		lcs_eol_one = wp->w_lcs_chars.eol; // eol until it's been used
@@ -1419,7 +1422,11 @@ win_line(
 		int pi;
 		int bcol = (int)(ptr - line);
 
-		if (n_extra > 0)
+		if (n_extra > 0
+# ifdef FEAT_LINEBREAK
+			&& !in_linebreak
+# endif
+			)
 		    --bcol;  // still working on the previous char, e.g. Tab
 
 		// Check if any active property ends.
@@ -1437,6 +1444,11 @@ win_line(
 					 * (text_props_active - (pi + 1)));
 			--text_props_active;
 			--pi;
+# ifdef FEAT_LINEBREAK
+			// not exactly right but should work in most cases
+			if (in_linebreak && syntax_attr == text_prop_attr)
+			    syntax_attr = 0;
+# endif
 		    }
 		}
 
@@ -1705,6 +1717,10 @@ win_line(
 		++p_extra;
 	    }
 	    --n_extra;
+#ifdef FEAT_LINEBREAK
+	    if (n_extra <= 0)
+		in_linebreak = FALSE;
+#endif
 	}
 	else
 	{
@@ -2030,6 +2046,8 @@ win_line(
 
 		    c_extra = mb_off > 0 ? MB_FILLER_CHAR : ' ';
 		    c_final = NUL;
+		    if (n_extra > 0)
+			in_linebreak = TRUE;
 		    if (VIM_ISWHITE(c))
 		    {
 # ifdef FEAT_CONCEAL

src/testdir/dumps/Test_prop_linebreak.dump

@@ -0,0 +1,10 @@
+>x+0&#ffffff0@49|]+0#ffffff16#e000002| +0#0000000#ffffff0@23
+|x@69| @4
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+| +0#0000000&@56|1|,|1| @10|A|l@1| 

src/testdir/test_textprop.vim

@@ -1615,6 +1615,24 @@ def Test_prop_add_delete_line()
   bwipe!
 enddef
 
+func Test_prop_in_linebreak()
+  CheckRunVimInTerminal
+
+  let lines =<< trim END
+    set breakindent linebreak breakat+=]
+    call printf('%s]%s', repeat('x', 50), repeat('x', 70))->setline(1)
+    call prop_type_add('test', #{highlight: 'ErrorMsg'})
+    call prop_add(1, 51, #{length: 1, type: 'test'})
+  END
+  call writefile(lines, 'XscriptPropLinebreak')
+  let buf = RunVimInTerminal('-S XscriptPropLinebreak', #{rows: 10})
+  call TermWait(buf)
+  call VerifyScreenDump(buf, 'Test_prop_linebreak', {})
+
+  call StopVimInTerminal(buf)
+  call delete('XscriptPropLinebreak')
+endfunc
+
 " Buffer number of 0 should be ignored, as if the parameter wasn't passed.
 def Test_prop_bufnr_zero()
   new

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3700,
 /**/
     3699,
 /**/