patch 8.2.4692: no test for what 8.2.4691 fixes

Problem:    No test for what 8.2.4691 fixes.
Solution:   Add a test.  Use a more generic sotlution. (closes #10090)
diff --git a/src/mouse.c b/src/mouse.c
index b81aff2..4296334 100644
--- a/src/mouse.c
+++ b/src/mouse.c
@@ -261,7 +261,10 @@
 	{
 	    // If the next character is the same mouse event then use that
 	    // one. Speeds up dragging the status line.
-	    if (vpeekc() != NUL)
+	    // Note: Since characters added to the stuff buffer in the code
+	    // below need to come before the next character, do not do this
+	    // when the current character was stuffed.
+	    if (!KeyStuffed && vpeekc() != NUL)
 	    {
 		int nc;
 		int save_mouse_row = mouse_row;