Column::remainder().clip(true) now shrinks when available width decreases

[germ4n]

Problem

Column::remainder().clip(true) grows correctly when the panel is made wider, but does not shrink when the panel is made narrower.

Root cause

There are two places in table.rs where the max_used_widths floor is applied to column widths. One correctly checks column.clip, the other doesn't.

Post-render path (already correct, line ~827):

if !column.clip {
    *column_width = column_width.at_least(max_used_widths[i]);
}

TableState::load pre-render path (the bug, line 647):

.at_least(column.width_range.min.max(*max_used))  // clip flag ignored

In TableState::load, .at_least(max_used) is applied to every column regardless of clip. For a Column::remainder(), max_used accumulates the historically widest rendered content. When the panel shrinks, this floor prevents the column from computing a smaller width, creating a cycle where it can never shrink.

Fix

Apply the same clip guard that already exists in the post-render path:

.at_least(if column.clip { column.width_range.min } else { column.width_range.min.max(*max_used) })

When clip = true, the floor is just width_range.min (0.0 by default), allowing the remainder column to shrink freely to the actual remaining space.

Minimal reproduction

use eframe::egui;
use egui_extras::{Column, TableBuilder};

fn main() -> eframe::Result {
    eframe::run_ui_native(
        "Column::remainder().clip(true) shrink test",
        Default::default(),
        |ui, _frame| {
            egui::Frame::central_panel(ui.style()).show(ui, |ui| {
                let mut text = String::from("some content");
                egui::ScrollArea::horizontal().show(ui, |ui| {
                    TableBuilder::new(ui)
                        .column(Column::auto())
                        .column(Column::remainder().clip(true))
                        .header(20.0, |mut header| {
                            header.col(|ui| { ui.strong("Auto"); });
                            header.col(|ui| { ui.strong("Remainder + clip"); });
                        })
                        .body(|mut body| {
                            body.row(18.0, |mut row| {
                                row.col(|ui| { ui.label("label"); });
                                row.col(|ui| {
                                    ui.add(
                                        egui::TextEdit::singleline(&mut text)
                                            .desired_width(f32::INFINITY),
                                    );
                                });
                            });
                        });
                });
            });
        },
    )
}

Without the fix: make the window wider (column grows ✓), then narrower — column does not shrink and a horizontal scrollbar appears ✗

fix-remainder-clip-shrink-before.mp4

With the fix: the column shrinks correctly and no scrollbar appears ✓

fix-remainder-clip-shrink-after.mp4

[github-actions]

Preview is being built...

Preview will be available at https://egui-pr-preview.github.io/pr/8048-fix-remainder-clip-shrink

View snapshot changes at kitdiff