Improved `icon.rs` example's text.

Added TODO and bug example (half-fixed it, background_color is still rounded).

TODO/_current.md

@@ -1,3 +1,19 @@
+```rust
+    use zero_ui_material_icons as icons;
+    App::default().extend(icons::MaterialFonts).run_window(async {
+        Window! {
+            //background_color = colors::YELLOW;
+            child_align = Align::CENTER;
+            child = Icon!{
+                ico = icons::outlined::N3G_MOBILEDATA;
+                //size = 500;
+                background_color = colors::RED;
+                border = 10, colors::GREEN.with_alpha(20.pct());
+            };
+        }
+    })
+```
+
 # TextInput
 
 * Implement selection.
@@ -14,6 +30,11 @@
     - Ellipses, fade-out.
     - Very visible in icon example.
 
+# Tooltip
+
+* Tooltips stop showing upon interaction (click/tab/enter/etc) in HTML.
+    - Ours doesn't.
+
 # View-Process
 
 * Update to winit-29 when released.

examples/icon.rs

@@ -168,8 +168,10 @@ fn icon_btn(ico: icons::MaterialIcon, font_mod: &'static str) -> impl UiNode {
                 },
                 Text! {
                     txt = formatx!("{ico}");
-                    txt_wrap = false;
+                    txt_align = Align::CENTER;
                     font_size = 10;
+                    height = 2.em();
+                    line_height = 1.em();
                 },
             ]
         };

zero-ui/src/widgets/icon.rs

@@ -41,7 +41,7 @@ fn on_build(wgt: &mut WidgetBuilding) {
 
     wgt.set_child(text::nodes::render_text());
 
-    wgt.push_intrinsic(NestGroup::FILL, "layout_text", text::nodes::layout_text);
+    wgt.push_intrinsic(NestGroup::CHILD_LAYOUT + 100, "layout_text", text::nodes::layout_text);
     wgt.push_intrinsic(NestGroup::EVENT, "resolve_text", move |child| {
         let node = text::nodes::resolve_text(child, icon.map(|i| i.glyph.clone().into()));
         let node = text::font_family(node, icon.map(|i| i.font.clone().into()));