Re: [fltk.general] Focus boxes are broken on my machine - Forums

On 9/10/21 6:35 PM imm wrote:

On Fri, 10 Sep 2021, 16:57 paveloom wrote:

Hello there!

I'm an fltk-rs user, but the problem I've encountered is appearing in other FLTK applications as well. Consider the following comparison of focus boxes on my machine (left) and on a virtual machine (right). Both are the same systems, Fedora 34.

There's a rendering bug in some X11 drivers that can look like that, so I'd guess that's what you are hitting.

Yes, see issue #156: https://github.com/fltk/fltk/issues/156

It's not really a fltk thing and I don't think we know how to work around it.

It's {very likely | definitely} an X11 driver thing (bug). There's a possible workaround if you set the line width to 1 rather than 0 (the default). The drawback is that setting the width to 1 slows things down and that's why it's not (yet?) done.

Maybe we should set the line width to 1 explicitly for the focus box which shouldn't harm much (in terms of drawing speed) but there are other visible effects (missing pixels in rectangles) as well.

I assume it's fine when you try your app on a different machine?

Unless that other machine has the same driver bug. :-(

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