patch 9.1.2014: clipboard: clipboard register corrupted with clipboard provider

Problem:  clipboard: clipboard register corrupted with clipboard
          provider (Satoru Kitaguchi and mikoto2000 after v9.1.1972)
Solution: Only adjust clipboard register points to the unnamed register
          (Foxe Chen)

fixes:  #18983
fixes:  #18988
closes: #19000

Signed-off-by: Foxe Chen <chen.foxe@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: 64-bitman

runtime/doc/options.txt

@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 9.1.  Last change: 2025 Dec 21
+*options.txt*	For Vim version 9.1.  Last change: 2025 Dec 23
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -1823,7 +1823,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 	prepend, e.g.: >
 		set clipboard^=unnamed
 <	When using the GUI see |'go-A'|.
-	When using the |clipboard-providers| feature, only the "unamed" and
+	When using the |clipboard-providers| feature, only the "unnamed" and
 	"unnamedplus" features will be recognized  If compiled without the
 	|+clipboard| feature but compiled with the |+clipboard_provider|
 	feature, then they will be the only values allowed and the other

src/clipboard.c

@@ -3534,7 +3534,7 @@ adjust_clip_reg(int *rp)
 #ifdef FEAT_CLIPBOARD_PROVIDER
     if (clipmethod == CLIPMETHOD_PROVIDER)
     {
-	if (clip_unnamed != 0)
+	if (*rp == 0 && clip_unnamed != 0)
 	    *rp = ((clip_unnamed & CLIP_UNNAMED_PLUS)) ? '+' : '*';
 	return;
     }

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2014,
 /**/
     2013,
 /**/