patch 8.0.1830: switching to Terminal-Normal mode does not redraw

Problem:    Switching to Terminal-Normal mode does not redraw. (Dominique
            Pelle)
Solution:   Also redraw when not updating the snapshot. (closes #2904)

src/terminal.c

@@ -1479,28 +1479,17 @@ cleanup_scrollback(term_T *term)
 
 /*
  * Add the current lines of the terminal to scrollback and to the buffer.
- * Called after the job has ended and when switching to Terminal-Normal mode.
  */
     static void
-move_terminal_to_buffer(term_T *term)
+update_snapshot(term_T *term)
 {
-    win_T	    *wp;
+    VTermScreen	    *screen;
     int		    len;
     int		    lines_skipped = 0;
     VTermPos	    pos;
     VTermScreenCell cell;
     cellattr_T	    fill_attr, new_fill_attr;
     cellattr_T	    *p;
-    VTermScreen	    *screen;
-
-    if (term->tl_vterm == NULL)
-	return;
-
-    /* Nothing to do if the buffer already has the lines and nothing was
-     * changed. */
-    if (!term->tl_dirty_snapshot && term->tl_buffer->b_ml.ml_line_count
-						> term->tl_scrollback_scrolled)
-	return;
 
     ch_log(term->tl_job == NULL ? NULL : term->tl_job->jv_channel,
 				  "Adding terminal window snapshot to buffer");
@@ -1601,12 +1590,33 @@ move_terminal_to_buffer(term_T *term)
 #ifdef FEAT_TIMERS
     term->tl_timer_set = FALSE;
 #endif
+}
+
+/*
+ * If needed, add the current lines of the terminal to scrollback and to the
+ * buffer.  Called after the job has ended and when switching to
+ * Terminal-Normal mode.
+ * When "redraw" is TRUE redraw the windows that show the terminal.
+ */
+    static void
+may_move_terminal_to_buffer(term_T *term, int redraw)
+{
+    win_T	    *wp;
+
+    if (term->tl_vterm == NULL)
+	return;
+
+    /* Update the snapshot only if something changes or the buffer does not
+     * have all the lines. */
+    if (term->tl_dirty_snapshot || term->tl_buffer->b_ml.ml_line_count
+					       <= term->tl_scrollback_scrolled)
+	update_snapshot(term);
 
     /* Obtain the current background color. */
     vterm_state_get_default_colors(vterm_obtain_state(term->tl_vterm),
 		       &term->tl_default_color.fg, &term->tl_default_color.bg);
 
-    if (term->tl_normal_mode)
+    if (redraw)
 	FOR_ALL_WINDOWS(wp)
 	{
 	    if (wp->w_buffer == term->tl_buffer)
@@ -1647,7 +1657,7 @@ term_check_timers(int next_due_arg, proftime_T *now)
 	    if (this_due <= 1)
 	    {
 		term->tl_timer_set = FALSE;
-		move_terminal_to_buffer(term);
+		may_move_terminal_to_buffer(term, FALSE);
 	    }
 	    else if (next_due == -1 || next_due > this_due)
 		next_due = this_due;
@@ -1675,7 +1685,7 @@ set_terminal_mode(term_T *term, int normal_mode)
 cleanup_vterm(term_T *term)
 {
     if (term->tl_finish != TL_FINISH_CLOSE)
-	move_terminal_to_buffer(term);
+	may_move_terminal_to_buffer(term, TRUE);
     term_free_vterm(term);
     set_terminal_mode(term, FALSE);
 }
@@ -1692,7 +1702,7 @@ term_enter_normal_mode(void)
     set_terminal_mode(term, TRUE);
 
     /* Append the current terminal contents to the buffer. */
-    move_terminal_to_buffer(term);
+    may_move_terminal_to_buffer(term, TRUE);
 
     /* Move the window cursor to the position of the cursor in the
      * terminal. */
@@ -2255,7 +2265,8 @@ theend:
     /* Move a snapshot of the screen contents to the buffer, so that completion
      * works in other buffers. */
     if (curbuf->b_term != NULL)
-	move_terminal_to_buffer(curbuf->b_term);
+	may_move_terminal_to_buffer(
+			       curbuf->b_term, curbuf->b_term->tl_normal_mode);
 
     return ret;
 }

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1830,
 /**/
     1829,
 /**/