Which data structure corresponds to the pane divider?

[denppa]

What Operating System(s) are you running on?

Linux Wayland

Which Wayland compositor or X11 Window manager(s) are you using?

KDE

WezTerm version

HEAD commit 4050072da21cc3106d0985281d75978c07e22abc

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Got wezterm to compile and made sure the changes apply by changing the set_fg_color in mod.rs to LinearRgba(1.0, 0.0, 0.0, 1.0), and indeed the background turns red. (doesn't "fg" usually represent foreground like the text?)

However, pardon my inexperience, this is my first time compiling and changing rust code, and I am not sure how the pane dividers are defined.

What data structure should I modify in order for the thickness of the pane divider to be change? By divider I mean the pane separator when splitHorizontal or splitVertical is triggered. Or is this not possible due to the rendering framework? I see that the window is wrapped in a quad struct, and then rects are drawn within, which suggests that modifying the pane's divider might not be easy as the sides might be defined in rect and are calculated in tandem.

[denppa]

Found the exact spot:

split.rs line 32:

        if split.direction == SplitDirection::Horizontal {
            self.filled_rectangle(
                layers,
                2,
                euclid::rect(
                    pos_x + (cell_width / 2.0),
                    pos_y - (cell_height / 2.0),
                    self.render_metrics.underline_height as f32 + 4.0,
                    (1. + split.size as f32) * cell_height,
                ),
                LinearRgba(1.0,0.0,0.0,1.0)
            )?;

Adding the + 4.0 achieved the effect of thickening a vertical split bar, which is being called a horizontal split in the code. The same can be mirrored for the horizontal split bar by adding the thickness in the ::Vertical function.

However, just adding the pixel value might not be optimal or maintainable, so I want to get some advice first. @wez

Follow up:
As the divider thickness follows underline_height, it is configurable via underline_thickness, with the side effect of also adjusting the underline thickness for things like a URL.