[BUG] ScrollView.show_scrollbars(false) only hides thumb, not entire bar
bug
**Describe the bug**
Based on the description, I assumed that `.show_scrollbars(false)` would hide the entire scrollbar, however, when I try it only hides the thumb elements.
**To Reproduce**
```
struct MyWidget{
pub size: Vec2
}
impl View for MyWidget {
fn draw(&self, printer: &Printer) {
printer.with_color(ColorStyle::new(ColorType::Palette(Primary), ColorType::Palette(Primary)), |p| {
let size = self.size;
for x in 0..size.x{
for y in 0..size.y{
p.print((x, y), " ")
}
}
})
}
fn required_size(&mut self, _constraint: Vec2) -> Vec2 {
self.size
}
}
fn main() {
// [...]
siv.add_fullscreen_layer(
ScrollView::new(
MyWidget::new()
.with_size(Vec2::new(1000, 1000))
)
.show_scrollbars(false)
);
// [...]
}
```
This results in the entire terminal being filled with "white" except the rightmost column; the constraint for the `required_size` of the widget is also one less than the width of the terminal.
**Expected behavior**
I would expect this option to not show the scrollbar, while also giving one more column to the content.
**Screenshots**
The contrast is not great. The darkest gray is the terminals background, the lighter gray is the scrollbar.
**Environment**
* Operating system used: Fedora 41
* Backend used: crossterm, but default has same behaviour
* Current locale:
```
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=
```
* Cursive version: crates.io, 0.21.1, features=toml
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