Button optimization (#3885)

* optimize button

* optimize

* simplify

* fix test

* explicit none

* sleep for animation

* test fix

* wait snapshots

* remove tab delay

* reduce delay

* fix

* schdule animations

* remove import [skip ci]

src/textual/_doc.py

@@ -127,6 +127,8 @@ async def auto_pilot(pilot: Pilot) -> None:
         if wait_for_animation:
             await pilot.wait_for_scheduled_animations()
             await pilot.pause()
+        await pilot.pause()
+        await pilot.wait_for_scheduled_animations()
         svg = app.export_screenshot(title=title)
 
         app.exit(svg)

src/textual/app.py

@@ -1185,6 +1185,9 @@ async def _press_keys(self, keys: Iterable[str]) -> None:
             if key.startswith("wait:"):
                 _, wait_ms = key.split(":")
                 await asyncio.sleep(float(wait_ms) / 1000)
+                await wait_for_idle(0)
+                await app._animator.wait_until_complete()
+                await wait_for_idle(0)
             else:
                 if len(key) == 1 and not key.isalnum():
                     key = _character_to_key(key)

src/textual/widgets/_button.py

@@ -156,7 +156,7 @@ class Button(Widget, can_focus=True):
     label: reactive[TextType] = reactive[TextType]("")
     """The text label that appears within the button."""
 
-    variant = reactive("default")
+    variant = reactive("default", init=False)
     """The variant name for the button."""
 
     class Pressed(Message):
@@ -204,10 +204,8 @@ def __init__(
         if label is None:
             label = self.css_identifier_styled
 
-        self.label = self.validate_label(label)
-
-        self.variant = self.validate_variant(variant)
-
+        self.label = label
+        self.variant = variant
         self.active_effect_duration = 0.3
         """Amount of time in seconds the button 'press' animation lasts."""
 

src/textual/widgets/_tabs.py

@@ -596,7 +596,7 @@ def animate_underline() -> None:
                     underline.animate("highlight_start", start, duration=0.3)
                     underline.animate("highlight_end", end, duration=0.3)
 
-                self.set_timer(0.05, animate_underline)
+                self.set_timer(0.02, lambda: self.call_after_refresh(animate_underline))
             else:
                 underline.highlight_start = start
                 underline.highlight_end = end

tests/snapshot_tests/test_snapshots.py

@@ -541,7 +541,7 @@ def test_richlog_scroll(snap_compare):
 def test_tabs_invalidate(snap_compare):
     assert snap_compare(
         SNAPSHOT_APPS_DIR / "tabs_invalidate.py",
-        press=["tab", "right"],
+        press=["tab", "right", "wait:350"],
     )
 
 
@@ -680,7 +680,9 @@ def test_scroll_to_center(snap_compare):
 
 def test_quickly_change_tabs(snap_compare):
     # https://github.com/Textualize/textual/issues/2229
-    assert snap_compare(SNAPSHOT_APPS_DIR / "quickly_change_tabs.py", press=["p"])
+    assert snap_compare(
+        SNAPSHOT_APPS_DIR / "quickly_change_tabs.py", press=["p", "wait:350"]
+    )
 
 
 def test_fr_unit_with_min(snap_compare):