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)
diff --git a/src/screen.c b/src/screen.c
index 4973b51..aade363 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -2547,10 +2547,10 @@
 	{
 #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;
 	}
     }
@@ -3396,7 +3396,7 @@
 	{
 	    if (lnum == curwin->w_cursor.lnum)
 		getvcol(curwin, &(curwin->w_cursor),
-						 (colnr_T *)&fromcol, NULL, NULL);
+					      (colnr_T *)&fromcol, NULL, NULL);
 	    else
 		fromcol = 0;
 	    if (lnum == curwin->w_cursor.lnum + search_match_lines)
diff --git a/src/textprop.c b/src/textprop.c
index 637ee7f..674faeb 100644
--- a/src/textprop.c
+++ b/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 @@
     char_u	*newtext;
     int		proplen;
     size_t	textlen;
-    char_u	*props;
+    char_u	*props = NULL;
     char_u	*newprops;
     textprop_T	tmp_prop;
     int		i;
diff --git a/src/version.c b/src/version.c
index cd2554a..0980420 100644
--- a/src/version.c
+++ b/src/version.c
@@ -780,6 +780,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    975,
+/**/
     974,
 /**/
     973,