Add watcher for cursor blink to ensure when blink is switched off, th…

…e cursor immediately becomes visible. Ensure we turn of cursor blink inside the input suggetions snapshot test.

src/textual/widgets/_input.py

@@ -330,6 +330,10 @@ def _watch_cursor_position(self) -> None:
 
         self.app.cursor_position = self.cursor_screen_offset
 
+    def _watch_cursor_blink(self, blink: bool) -> None:
+        if not blink:
+            self._cursor_visible = True
+
     @property
     def cursor_screen_offset(self) -> Offset:
         """The offset of the cursor of this input in screen-space. (x, y)/(column, row)"""

tests/snapshot_tests/test_snapshots.py

@@ -102,7 +102,10 @@ def test_input_validation(snap_compare):
 
 
 def test_input_suggestions(snap_compare):
-    assert snap_compare(SNAPSHOT_APPS_DIR / "input_suggestions.py", press=[])
+    async def run_before(pilot):
+        pilot.app.query_one(Input).cursor_blink = False
+
+    assert snap_compare(SNAPSHOT_APPS_DIR / "input_suggestions.py", press=[], run_before=run_before)
 
 
 def test_buttons_render(snap_compare):