patch 8.1.0975: using STRNCPY() wrongly. Warning for uninitialized variable

Problem:    Using STRNCPY() wrongly. Warning for uninitialized variable.
Solution:   Use mch_memmove(). Initialize variable. (Yasuhiro Matsumoto,
            closes #3979)

src/screen.c

@@ -2547,10 +2547,10 @@ text_to_screenline(win_T *wp, char_u *text, int col)
 	{
 #ifdef FEAT_RIGHTLEFT
 	    if (wp->w_p_rl)
-		STRNCPY(current_ScreenLine, text, len);
+		mch_memmove(current_ScreenLine, text, len);
 	    else
 #endif
-		STRNCPY(current_ScreenLine + col, text, len);
+		mch_memmove(current_ScreenLine + col, text, len);
 	    col += len;
 	}
     }

src/textprop.c

@@ -17,6 +17,7 @@
  * Text properties have a type, which can be used to specify highlighting.
  *
  * TODO:
+ * - When using 'cursorline' attributes should be merged. (#3912)
  * - Adjust text property column and length when text is inserted/deleted.
  *   -> a :substitute with a multi-line match
  *   -> search for changed_bytes() from misc1.c
@@ -27,7 +28,10 @@
  *   the index, like DB_MARKED?
  * - Also test line2byte() with many lines, so that ml_updatechunk() is taken
  *   into account.
- * - add mechanism to keep track of changed lines.
+ * - Add mechanism to keep track of changed lines, so that plugin can update
+ *   text properties in these.
+ * - Perhaps have a window-local option to disable highlighting from text
+ *   properties?
  */
 
 #include "vim.h"
@@ -158,7 +162,7 @@ f_prop_add(typval_T *argvars, typval_T *rettv UNUSED)
     char_u	*newtext;
     int		proplen;
     size_t	textlen;
-    char_u	*props;
+    char_u	*props = NULL;
     char_u	*newprops;
     textprop_T	tmp_prop;
     int		i;

src/version.c

@@ -779,6 +779,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    975,
 /**/
     974,
 /**/