servoshell: Respond resize with authentic result and Adjust minimum window size (#38258)

- We no longer pretend that resize is always successful and simplify the
result computation.
- Adjust minimum window size to match other browsers and the test
expectation.
- Restrict some unnecessary access specifier.

Testing: ` ./mach test-wpt -r
"tests\wpt\tests\webdriver\tests\classic\set_window_rect\set.py"
--log-raw "D:\servo test log\set.txt" --product servodriver
{--headless}`
Fixes: #37804 as Task 8 is last task.

---------

Signed-off-by: Euclid Ye <euclid.ye@huawei.com>

ports/servoshell/desktop/window_trait.rs

@@ -15,12 +15,17 @@ use servo::{Cursor, RenderingContext, ScreenGeometry, WebView};
 use super::app_state::RunningAppState;
 
 // This should vary by zoom level and maybe actual text size (focused or under cursor)
-pub const LINE_HEIGHT: f32 = 76.0;
-pub const LINE_WIDTH: f32 = 76.0;
+pub(crate) const LINE_HEIGHT: f32 = 76.0;
+pub(crate) const LINE_WIDTH: f32 = 76.0;
 // MouseScrollDelta::PixelDelta is default for MacOS, which is high precision and very slow
 // in winit. Therefore we use a factor of 4.0 to make it more usable.
 // See https://github.com/servo/servo/pull/34063#discussion_r2197729507
-pub const PIXEL_DELTA_FACTOR: f64 = 4.0;
+pub(crate) const PIXEL_DELTA_FACTOR: f64 = 4.0;
+
+/// <https://github.com/web-platform-tests/wpt/blob/9320b1f724632c52929a3fdb11bdaf65eafc7611/webdriver/tests/classic/set_window_rect/set.py#L287-L290>
+/// "A window size of 10x10px shouldn't be supported by any browser."
+pub(crate) const MIN_INNER_WIDTH: i32 = 20;
+pub(crate) const MIN_INNER_HEIGHT: i32 = 20;
 
 pub trait WindowPortsMethods {
     fn id(&self) -> winit::window::WindowId;