patch 8.0.1515: BufWinEnter event fired when opening hidden terminal

Problem:    BufWinEnter event fired when opening hidden terminal.
Solution:   Do not fire BufWinEnter when the terminal is midden and does not
            open a window. (Kenta Sato, closes #2636)

Author: brammool

src/terminal.c

@@ -475,9 +475,12 @@ term_start(typval_T *argvar, jobopt_T *opt, int forceit)
 	channel_set_nonblock(term->tl_job->jv_channel, PART_IN);
 
 #ifdef FEAT_AUTOCMD
-	++curbuf->b_locked;
-	apply_autocmds(EVENT_BUFWINENTER, NULL, NULL, FALSE, curbuf);
-	--curbuf->b_locked;
+	if (!opt->jo_hidden)
+	{
+	    ++curbuf->b_locked;
+	    apply_autocmds(EVENT_BUFWINENTER, NULL, NULL, FALSE, curbuf);
+	    --curbuf->b_locked;
+	}
 #endif
 
 	if (old_curbuf != NULL)

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1515,
 /**/
     1514,
 /**/