patch 8.0.0872: no mouse scroll with a terminal window

Problem:    Using mouse scroll while a terminal window has focus and the mouse
            pointer is on another window does not work.  Same for focus in a
            non-terminal window ahd the mouse pointer is over a terminal
            window.
Solution:   Send the scroll action to the right window.

Author: brammool

src/normal.c

@@ -4638,6 +4638,11 @@ nv_mousescroll(cmdarg_T *cap)
 
     if (cap->arg == MSCR_UP || cap->arg == MSCR_DOWN)
     {
+# ifdef FEAT_TERMINAL
+	if (term_use_loop())
+	    send_keys_to_term(curbuf->b_term, cap->cmdchar, TRUE);
+	else
+# endif
 	if (mod_mask & (MOD_MASK_SHIFT | MOD_MASK_CTRL))
 	{
 	    (void)onepage(cap->arg ? FORWARD : BACKWARD, 1L);

src/proto/terminal.pro

@@ -5,6 +5,7 @@ void write_to_term(buf_T *buffer, char_u *msg, channel_T *channel);
 int term_job_running(term_T *term);
 int term_in_terminal_mode(void);
 void term_leave_terminal_mode(void);
+int send_keys_to_term(term_T *term, int c, int typed);
 int term_use_loop(void);
 int terminal_loop(void);
 void term_job_ended(job_T *job);

src/terminal.c

@@ -37,7 +37,6 @@
  *
  * TODO:
  * - MS-Windows: no redraw for 'updatetime'  #1915
- * - mouse scroll: when over other window, scroll that window.
  * - add argument to term_wait() for waiting time.
  * - For the scrollback buffer store lines in the buffer, only attributes in
  *   tl_scrollback.
@@ -909,7 +908,7 @@ term_vgetc()
  * Return FAIL when the key needs to be handled in Normal mode.
  * Return OK when the key was dropped or sent to the terminal.
  */
-    static int
+    int
 send_keys_to_term(term_T *term, int c, int typed)
 {
     char	msg[KEY_BUF_LEN];
@@ -948,13 +947,18 @@ send_keys_to_term(term_T *term, int c, int typed)
 	case K_X1RELEASE:
 	case K_X2MOUSE:
 	case K_X2RELEASE:
+
+	case K_MOUSEUP:
+	case K_MOUSEDOWN:
+	case K_MOUSELEFT:
+	case K_MOUSERIGHT:
 	    if (mouse_row < W_WINROW(curwin)
 		    || mouse_row >= (W_WINROW(curwin) + curwin->w_height)
 		    || mouse_col < W_WINCOL(curwin)
 		    || mouse_col >= W_ENDCOL(curwin)
 		    || dragging_outside)
 	    {
-		/* click outside the current window */
+		/* click or scroll outside the current window */
 		if (typed)
 		{
 		    stuffcharReadbuff(c);

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    872,
 /**/
     871,
 /**/