wrapping: keep prepending to the same next line as long as possible

Only when the cursor has moved off of the currrent line do we stop
prepending wrapped words to the next line.

This partially fixes https://savannah.gnu.org/bugs/?52576.

src/nano.c

@@ -1635,13 +1635,6 @@ int do_input(bool allow_funcs)
      * all available characters in the input puddle.  Note that this
      * puddle will be empty if we're in view mode. */
     if (have_shortcut || get_key_buffer_len() == 0) {
-#ifdef ENABLE_WRAPPING
-	/* If we got a shortcut or toggle, and it's not the shortcut
-	 * for verbatim input, turn off prepending of wrapped text. */
-	if (have_shortcut && s->scfunc != do_verbatim_input)
-	    wrap_reset();
-#endif
-
 	if (puddle != NULL) {
 	    /* Insert all bytes in the input buffer into the edit buffer
 	     * at once, filtering out any low control codes. */
@@ -1709,6 +1702,11 @@ int do_input(bool allow_funcs)
 		refresh_needed = TRUE;
 	    }
 #endif
+#ifdef ENABLE_WRAPPING
+	    /* If the cursor moved to another line, clear the prepend flag. */
+	    if (openfile->current != was_current)
+		wrap_reset();
+#endif
 #ifdef ENABLE_COLOR
 	    if (f && !f->viewok)
 		check_the_multis(openfile->current);