Text goes to newline without pressing enter

**Describe the bug**
When using Multiline widget, the text goes to next line as soon as the current line fills up, it shouldn't happen until unless user press enter, it must render the text in same line as it is default behaviour in text editors, browsers, etc.

**To Reproduce**
```rust
use eframe::egui;

fn main() -> eframe::Result {
let options = eframe::NativeOptions {
viewport: egui::ViewportBuilder::default().with_inner_size([320.0, 240.0]),
..Default::default()
};
eframe::run_native(
"My egui App",
options,
Box::new(|_cc| Ok(Box::::default())),
)
}

#[derive(Default)]
struct MyApp {
text: String,
}

impl eframe::App for MyApp {
fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
egui::CentralPanel::default().show(ctx, |ui| {
egui::ScrollArea::both()
.max_width(f32::INFINITY)
.show(ui, |ui| {
ui.add(
egui::TextEdit::multiline(&mut self.text)
.desired_width(f32::INFINITY)
.desired_rows(12)
.lock_focus(true)
.code_editor(),
);
});
});
}
}
```

**Expected behavior**
As soon as the text overflows the current widget width, it should continue in the same line by expanding and create a scrollbar.

**Screenshots**

**Desktop (please complete the following information):**
- OS: Windows 11

**Additional context**
I tested it using `glow` OpenGL as renderer

Start with the supplied eframe example, especially TextEdit::multiline, desired_width, ScrollArea, and code_editor, then reproduce the wrapping on Windows or another desktop setup. Trace the multiline widget's width and overflow behavior; done means long text stays on one visual line, expands horizontally, and exposes a scrollbar without requiring Enter.

Written by the indexing model from the issue text.