Regression: TextEdit claims full width even with smaller desired_width

[crumblingstatue]

#5266 makes TextEdit have an "intrinsic" size, which I'm guessing makes containers expand to the size it reports as intrinsic size.
EDIT: #3660 is the cause, see #5500 (comment)
The problem is that it seems to claim the full width of the text, even when desired_width is smaller.
This causes things like side panels to expand way too far for long text, and possibly flicker a lot if the text width changes.

Here is an example of a SidePanel::right expanding way too far (due to very long floating point number displayed in the text edit)
desired_width is set to 100.0 in this example case.

[crumblingstatue]

If this is intended behavior, then there should be some kind of way to set a max "default width" for a SidePanel that it won't automatically expand beyond, unless the user explicitly resizes. Otherwise I don't know how to avoid the flickering without limiting the max width, which also prevents the user from being able to resize beyond the set limit, which I want to allow.

[lucasmerlin]

Egui currently does absolutely nothing with the intrinsic size, it's just set so it can be read e.g. in egui_flex, for advanced layouting. So this issue must be something else. Can you try to make a minimal reproduction?

[UnknownSuperficialNight]

I made a discussion about this thinking it was intended but after testing I figured I don't think it is.

Egui currently does absolutely nothing with the intrinsic size, it's just set so it can be read e.g. in egui_flex, for advanced layouting. So this issue must be something else. Can you try to make a minimal reproduction?

Here is my discussion it has a small example including a video.

[crumblingstatue]

Can you try to make a minimal reproduction?

Here is a minimal reproduction

use eframe::{NativeOptions, egui};

fn main() {
    let mut strbuf = String::from(
        "Once upon a time there was a very very long string that went out to the store to get some chocolate milk",
    );
    eframe::run_simple_native("footest", NativeOptions::default(), move |ctx, _frame| {
        egui::SidePanel::right("right_panel").show(ctx, |ui| {
            ui.text_edit_singleline(&mut strbuf);
        });
    })
    .unwrap();
}

eframe 0.29

eframe 0.30

[crumblingstatue]

I did a bisect, and it turns out the cause is #3660 , so I apologize for blaming the wrong pull request.
In particular, it seems like this part is responsible:

@@ -720,6 +721,16 @@ impl<'t> TextEdit<'t> {
                 }
             }

+            // Allocate additional space if edits were made this frame that changed the size. This is important so that,
+            // if there's a ScrollArea, it can properly scroll to the cursor.
+            let extra_size = galley.size() - rect.size();
+            if extra_size.x > 0.0 || extra_size.y > 0.0 {
+                ui.allocate_rect(
+                    Rect::from_min_size(outer_rect.max, extra_size),
+                    Sense::hover(),
+                );
+            }
+