patch 8.2.3484: crash when going through spell suggestions

Problem:    Crash when going through spell suggestions.
Solution:   Limit the text length for finding suggestions to the original
            length.  Do not update buffers when exiting. (closes #8965)
diff --git a/src/clipboard.c b/src/clipboard.c
index b1da99b..c0c21ae 100644
--- a/src/clipboard.c
+++ b/src/clipboard.c
@@ -199,7 +199,8 @@
 					    || get_real_state() == SELECTMODE)
 		&& (cbd == &clip_star ?
 				clip_isautosel_star() : clip_isautosel_plus())
-		&& HL_ATTR(HLF_V) != HL_ATTR(HLF_VNC))
+		&& HL_ATTR(HLF_V) != HL_ATTR(HLF_VNC)
+		&& !exiting)
 	{
 	    update_curbuf(INVERTED_ALL);
 	    setcursor();