editor: Represent scroll offset with more precision (#39367)

Closes #5355

Release Notes:

- Fixed rendering glitches with files with more than 16 million lines
(that occured due to floating number rounding errors).

---------

Co-authored-by: Smit Barmase <heysmitbarmase@gmail.com>

crates/ui/src/utils/search_input.rs

@@ -1,20 +1,20 @@
-use gpui::Pixels;
+use gpui::{Pixels, px};
 
 pub struct SearchInputWidth;
 
 impl SearchInputWidth {
     /// The container size in which the input stops filling the whole width.
-    pub const THRESHOLD_WIDTH: f32 = 1200.0;
+    pub const THRESHOLD_WIDTH: Pixels = px(1200.0);
 
     /// The maximum width for the search input when the container is larger than the threshold.
-    pub const MAX_WIDTH: f32 = 1200.0;
+    pub const MAX_WIDTH: Pixels = px(1200.0);
 
     /// Calculates the actual width in pixels based on the container width.
     pub fn calc_width(container_width: Pixels) -> Pixels {
-        if container_width.0 < Self::THRESHOLD_WIDTH {
+        if container_width < Self::THRESHOLD_WIDTH {
             container_width
         } else {
-            Pixels(container_width.0.min(Self::MAX_WIDTH))
+            container_width.min(Self::MAX_WIDTH)
         }
     }
 }