Re: Hollow cursor under images

[Evgeny Zajcev <lg.zevlg@gmail.com>]

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вт, 5 мар. 2019 г. в 01:36, Alan Third <alan@idiocy.org>:

> On Mon, Mar 04, 2019 at 11:04:10PM +0300, Evgeny Zajcev wrote:
> >
> > I have text property `face' attached to the region which image occupies,
> > consider:
> >
> > (let ((svg (svg-create (frame-char-width) (* 2 (frame-char-height)))))
> >   (svg-circle svg 10 10 10 :fill-color "red")
> >   (insert (propertize "X" 'face 'region
> >                       'display (list '(slice 0.0 0.0 1.0 0.5)
> >                                      (svg-image svg :scale 1.0
> >                                                 :ascent 'center
> >                                                 :mask 'heuristic)))))
> >
> > Background of the image gets color from `region' face, but when the
> cursor
> > is under the image it gets hollow type and still background of `region'
> > face is visible.
> >
> > I just realized, that if I create image that fits into single char, such
> as:
> >
> > (let ((svg (svg-create (frame-char-width) (frame-char-height))))
> >   (svg-circle svg 10 10 10 :fill-color "red")
> >   (insert (propertize "X" 'face 'region
> >                       'display (svg-image svg :scale 1.0
> >                                           :ascent 'center
> >                                           :mask 'heuristic))))
> >
> > Then cursor behaves as expected initially!  It does not get hollow type
> and
> > background gets cursor color.  I expected the same for images that do not
> > fit into single char
>
> I can confirm this happens on X. I can see it in a build from 2017, so
> it’s not been caused by my image resizing code, which was my initial
> thought.
>
> The key image dimension appears to be 32 pixels. At 32 and below the
> cursor shows through the background colour. At 33 and above, the
> background remains white and the cursor appears as a box round the
> image.
>
> So a 32x32 image shows the cursor, a 33x32 or 32x33 image doesn’t.
>
>
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

-- 
lg

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