Difficult to create an Into<WidgetText> that looks like a composite of RichTexts

[OmegaJak]

The Problem
I'm looking to using text with mixed formatting as the text of a CollapsingHeader, whose parameter is an Into<WidgetText>. In my case, I am trying to get ordinary body text, with one word in the middle bolded (like this: "Using: Chrome (started using 2 minutes ago)"). As far as I can tell, this currently requires the use of a LayoutJob, whose API, while allowing a great deal of control, is not very ergonomic and takes some work to make it visually match a RichText.

Example
The best way I know how to achieve this currently looks something like this:

let layout_job = LayoutJob::default();
let font_id = ui
    .style()
    .text_styles
    .get(&egui::TextStyle::Body)
    .unwrap()
    .clone();
layout_job.append(
    "Using: ",
    0.0,
    TextFormat {
        font_id: font_id.clone(),
        color: ui.style().visuals.text_color(),
        ..Default::default()
    },
);
layout_job.append(
    &format!("{} ", self.current_window.app_name),
    0.0,
    TextFormat {
        font_id: font_id.clone(),
        color: ui.style().visuals.strong_text_color(),
        ..Default::default()
    },
);
layout_job.append(
    &format!("(started using {})", time_using_current),
    0.0,
    TextFormat {
        font_id: font_id.clone(),
        color: ui.style().visuals.text_color(),
        ..Default::default()
    },
);

I could reduce a little duplication by pulling the 'normal text' TextFormat into a variable, but this is still a lot of code just to get one part of the text bolded. Manipulating TextFormat directly is much more difficult than using a RichText.

My Dream
I would love if there were an easy way to make something implementing Into<WidgetText> from multiple RichTexts. The RichText api is very ergonomic, and this would ensure visual consistency across the application.

I will be raising a PR shortly that takes a small step towards this, but I'm not sure if it's the best solution.

[hailiangyuan]

good idea