Paint: text background while editing is white, not transparent

[godiard]

In activities where we need edit text over the canvas, like in Paint, the technique used is place a TextView inside a Gtk.Fixed, and move the TextView to the needed position in the canvas.
Until os7, we can do:

self.textview.override_background_color(Gtk.StateFlags.NORMAL,

Gdk.RGBA(0, 0, 0, 0))

And the text had a tranparent background.

This is not working anymore in os8, the background is black, and break the effect.

To test this problem, need apply Paint commit 45d6940a1e454b169243f7742780fa6b0942fc67.

This problem is affecting other activities like Portfolio, but can use a workaround changing the background color. (The background color can be overrided, but the alpha is applied like if behind there are a black object, then if alpha is 0, shows black)

[walter]

FWIW, I've implemented a work-around (the added complexity of determining the background color instead of using transparency) for Portfolio and can do the same for TurtleArt and Sliderule. But for Paint and some others will not allow that work-around.

[manuq]

Doing the views transparent with the css provokes the same issue in Paint, but views are transparent in other Sugar places. So seems like a bug in Paint/Cairo.

I tested setting the view to transparent with the theme and removing the Paint override. In gtk-widgets.css, the change is:

.view {
    border-width: 0px;
    border-style: none;
    border-radius: 0px;
    padding: 0px;
-    background-color: @white;
+    background-color: transparent;
}

[godiard]

I have reverted the change in Paint. We can try get this transparent in the next cycle.

[dnarvaez]

Milestone 1.0 deleted

[godiard]

This is happening in the XO, but not in my desktop. Tested on xo-4