patch 8.2.2860: adding a text property causes the whole window to be …

…redawn

Problem:    Adding a text property causes the whole window to be redawn.
Solution:   Use changed_lines_buf() to only redraw the affected lines.

src/change.c

@@ -758,7 +758,7 @@ deleted_lines_mark(linenr_T lnum, long count)
 /*
  * Marks the area to be redrawn after a change.
  */
-    static void
+    void
 changed_lines_buf(
     buf_T	*buf,
     linenr_T	lnum,	    // first line with change

src/proto/change.pro

@@ -14,6 +14,7 @@ void appended_lines(linenr_T lnum, long count);
 void appended_lines_mark(linenr_T lnum, long count);
 void deleted_lines(linenr_T lnum, long count);
 void deleted_lines_mark(linenr_T lnum, long count);
+void changed_lines_buf(buf_T *buf, linenr_T lnum, linenr_T lnume, long xtra);
 void changed_lines(linenr_T lnum, colnr_T col, linenr_T lnume, long xtra);
 void unchanged(buf_T *buf, int ff, int always_inc_changedtick);
 void save_file_ff(buf_T *buf);

src/textprop.c

@@ -345,7 +345,8 @@ prop_add_common(
     }
 
     buf->b_has_textprop = TRUE;  // this is never reset
-    redraw_buf_later(buf, NOT_VALID);
+    changed_lines_buf(buf, start_lnum, end_lnum + 1, 0);
+    redraw_buf_later(buf, VALID);
 }
 
 /*

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2860,
 /**/
     2859,
 /**/