[BUG] Panic when resizing the Terminal too small

[FriederHannenheim]

Describe the bug

thread '<unnamed>' panicked at 'assertion failed: `(left == right)`
  left: `1`,
 right: `2`: Was promised 2, received 1', /home/fried/.cargo/registry/src/github.com-1ecc6299db9ec823/cursive_core-0.3.7/src/views/edit_view.rs:513:9

To Reproduce
Create a layout with an edit view and resize the terminal very small

Expected behavior
It doesn't crash and when I resize it back to big the layout is still there

Environment

• Linux
• Backend used: crossterm
• Current locale (run locale in a terminal)

LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC=de_DE.UTF-8
LC_TIME=de_DE.UTF-8
LC_COLLATE="en_US.UTF-8"
LC_MONETARY=de_DE.UTF-8
LC_MESSAGES="en_US.UTF-8"
LC_PAPER=de_DE.UTF-8
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT=de_DE.UTF-8
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

• Cursive version (from crates.io, from git, ...)
  0.20.0 from crates.io

Additional context
Terminal used: Alacritty

[gyscos]

Hi, and thanks for the report! Will have a look.

[gyscos]

Would you happen to have an example that can cause the crash? I'm trying with the edit example, but it doesn't seem to crash when resized as small as possible.

[deepakjacob]

Can confirm that this issue occurs with cursive 0.21.1 and alacritty 0.13.2. Other terminals also generate the same error when resizing (XFCE Terminal, Gnome Terminal, Ptyxis, etc.). Resizing the window—making it larger and then smaller—consistently triggers this issue.

use cursive::{
    view::Resizable,
    views::{EditView, LinearLayout},
};

fn main() {
    let mut siv = cursive::default();
    let layout = LinearLayout::vertical().child(
        EditView::new()
            .on_edit(move |_s, text, _cursor| {
                println!("{}", text);
            })
            .full_width(),
    );
    siv.add_fullscreen_layer(layout.full_screen());
    siv.run();
}

Panic occurred in file '/home/dijkstra/.cargo/registry/src/index.crates.io-6f17d22bba15001f/cursive_core-0.4.6/src/views/edit_view.rs' at line 521

line 521 is the assert_eq macro in the draw fn

impl View for EditView {
    fn draw(&self, printer: &Printer) {
        assert_eq!(
            printer.size.x, self.last_length,
            "Was promised {}, received {}",
            self.last_length, printer.size.x
        );
        ....