Avoid leaving garbage on screen when using 'raise' display property

* src/xdisp.c (display_line): Reset voffset value of the iterator
when it hits ZV, to avoid "inheriting" it to glyph rows past ZV,
which then leaves stuff on screen that needs to be cleared by
redisplay.  (Bug#25855)

diff --git a/src/xdisp.c b/src/xdisp.c
index b0644882bdc6a1403e2d118b94f713af49d24e87..91eef0ec47533ef57bfea99621493c37ad0cd756 100644 (file)
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -20733,6 +20733,12 @@ display_line (struct it *it)
            }
 
          it->continuation_lines_width = 0;
+         /* Reset those iterator values set from display property
+            values.  This is for the case when the display property
+            ends at ZV, and is not a replacing property, so pop_it is
+            not called.  */
+         it->font_height = Qnil;
+         it->voffset = 0;
          row->ends_at_zv_p = true;
          /* A row that displays right-to-left text must always have
             its last face extended all the way to the end of line,
@@ -20919,6 +20925,8 @@ display_line (struct it *it)
                                {
                                  row->exact_window_width_line_p = true;
                                  it->continuation_lines_width = 0;
+                                 it->font_height = Qnil;
+                                 it->voffset = 0;
                                  row->continued_p = false;
                                  row->ends_at_zv_p = true;
                                }
@@ -21236,6 +21244,8 @@ display_line (struct it *it)
              if (!get_next_display_element (it))
                {
                  it->continuation_lines_width = 0;
+                 it->font_height = Qnil;
+                 it->voffset = 0;
                  row->ends_at_zv_p = true;
                  row->exact_window_width_line_p = true;
                  break;