вт, 5 мар. 2019 г. в 13:19, Evgeny Zajcev <lg.zevlg@gmail.com>:

> [...]
>
In my case 32 for width is the trigger and `(frame-char-height) == 53' for
> height triggers the hollow cursor behaviour.
>
> Looks like a bug
>

I've found this in xdisp.c:

....
  if (cursor_type == FILLED_BOX_CURSOR)
   {
     /* Using a block cursor on large images can be very annoying.
So use a hollow cursor for "large" images.
If image is not transparent (no mask), also use hollow cursor.  */
     struct image *img = IMAGE_OPT_FROM_ID (f, glyph->u.img_id);
     if (img != NULL && IMAGEP (img->spec))
{
 /* Arbitrarily, interpret "Large" as >32x32 and >NxN
    where N = size of default frame font size.
    This should cover most of the "tiny" icons people may use.  */
 if (!img->mask
     || img->width > max (32, WINDOW_FRAME_COLUMN_WIDTH (w))
     || img->height > max (32, WINDOW_FRAME_LINE_HEIGHT (w)))
   cursor_type = HOLLOW_BOX_CURSOR;
}
....

Maybe introduce some property in image spec to control cursor behaviour?
Or make customizable definition for "tiny" icons?

Thanks

-- 
lg