Add an animation to the LSP checking indicator (#9463)

Spinner go spinny.

Extra thanks to @kvark for helping me with the shaders.



https://github.com/zed-industries/zed/assets/2280405/9d5f4f4e-0d43-44d2-a089-5d69939938e9


Release Notes:

- Added a spinning animation to the LSP checking indicator

---------

Co-authored-by: Dzmitry Malyshau <kvark@fastmail.com>

crates/gpui/src/window/element_cx.rs

@@ -35,8 +35,8 @@ use crate::{
     GlyphId, Hsla, ImageData, InputHandler, IsZero, KeyContext, KeyEvent, LayoutId,
     LineLayoutIndex, MonochromeSprite, MouseEvent, PaintQuad, Path, Pixels, PlatformInputHandler,
     Point, PolychromeSprite, Quad, RenderGlyphParams, RenderImageParams, RenderSvgParams, Scene,
-    Shadow, SharedString, Size, StrikethroughStyle, Style, TextStyleRefinement, Underline,
-    UnderlineStyle, Window, WindowContext, SUBPIXEL_VARIANTS,
+    Shadow, SharedString, Size, StrikethroughStyle, Style, TextStyleRefinement,
+    TransformationMatrix, Underline, UnderlineStyle, Window, WindowContext, SUBPIXEL_VARIANTS,
 };
 
 pub(crate) type AnyMouseListener =
@@ -1007,6 +1007,7 @@ impl<'a> ElementContext<'a> {
                     content_mask,
                     color,
                     tile,
+                    transformation: TransformationMatrix::unit(),
                 });
         }
         Ok(())
@@ -1072,6 +1073,7 @@ impl<'a> ElementContext<'a> {
         &mut self,
         bounds: Bounds<Pixels>,
         path: SharedString,
+        transformation: TransformationMatrix,
         color: Hsla,
     ) -> Result<()> {
         let scale_factor = self.scale_factor();
@@ -1103,6 +1105,7 @@ impl<'a> ElementContext<'a> {
                 content_mask,
                 color,
                 tile,
+                transformation,
             });
 
         Ok(())
@@ -1266,6 +1269,11 @@ impl<'a> ElementContext<'a> {
         self.window.next_frame.dispatch_tree.set_view_id(view_id);
     }
 
+    /// Get the last view id for the current element
+    pub fn parent_view_id(&mut self) -> Option<EntityId> {
+        self.window.next_frame.dispatch_tree.parent_view_id()
+    }
+
     /// Sets an input handler, such as [`ElementInputHandler`][element_input_handler], which interfaces with the
     /// platform to receive textual input with proper integration with concerns such
     /// as IME interactions. This handler will be active for the upcoming frame until the following frame is