Fix links and text selection in horizontal_wrapped layout (#6905)

* Closes <https://github.com/emilk/egui/issues/6904>
* [x] I have followed the instructions in the PR template

This was broken in https://github.com/emilk/egui/pull/5411. Not sure if
this is the best fix or if `PlacedRow::rect` should be updated, but I
think it makes sense that PlacedRow::rect ignores leading space.

crates/epaint/src/text/text_layout_types.rs

@@ -576,10 +576,18 @@ pub struct PlacedRow {
 
 impl PlacedRow {
     /// Logical bounding rectangle on font heights etc.
-    /// Use this when drawing a selection or similar!
+    ///
+    /// This ignores / includes the `LayoutSection::leading_space`.
     pub fn rect(&self) -> Rect {
         Rect::from_min_size(self.pos, self.row.size)
     }
+
+    /// Same as [`Self::rect`] but excluding the `LayoutSection::leading_space`.
+    pub fn rect_without_leading_space(&self) -> Rect {
+        let x = self.glyphs.first().map_or(self.pos.x, |g| g.pos.x);
+        let size_x = self.size.x - x;
+        Rect::from_min_size(Pos2::new(x, self.pos.y), Vec2::new(size_x, self.size.y))
+    }
 }
 
 impl std::ops::Deref for PlacedRow {