Fix bug where all editor completions would be black (#28548)

Release Notes:

- N/A

crates/gpui/src/elements/text.rs

@@ -1,10 +1,12 @@
 use crate::{
     ActiveTooltip, AnyView, App, Bounds, DispatchPhase, Element, ElementId, GlobalElementId,
     HighlightStyle, Hitbox, IntoElement, LayoutId, MouseDownEvent, MouseMoveEvent, MouseUpEvent,
-    Pixels, Point, SharedString, Size, TextOverflow, TextRun, TextStyle, TooltipId, WhiteSpace,
-    Window, WrappedLine, WrappedLineLayout, register_tooltip_mouse_handlers, set_tooltip_on_window,
+    Pixels, Point, SharedString, Size, TextAlign, TextOverflow, TextRun, TextStyle,
+    TextStyleRefinement, TooltipId, WhiteSpace, Window, WrappedLine, WrappedLineLayout,
+    register_tooltip_mouse_handlers, set_tooltip_on_window,
 };
 use anyhow::anyhow;
+use refineable::Refineable as _;
 use smallvec::SmallVec;
 use std::{
     cell::{Cell, RefCell},
@@ -416,13 +418,17 @@ impl TextLayout {
         let line_height = element_state.line_height;
         let mut line_origin = bounds.origin;
 
-        let text_style = window.text_style();
+        // Get current text_style refinements
+        let mut text_style = TextStyleRefinement::default();
+        for style in window.text_style_stack.iter().as_ref() {
+            text_style.refine(&style);
+        }
 
         for line in &element_state.lines {
             line.paint_background(
                 line_origin,
                 line_height,
-                text_style.text_align,
+                text_style.text_align.unwrap_or(TextAlign::Left),
                 Some(bounds),
                 window,
                 cx,