Fixes for LoadingSpinner label and size (#5230)

panel/widgets/indicators.py

@@ -42,7 +42,7 @@
 )
 from ..pane.markup import Str
 from ..reactive import SyncableData
-from ..util import escape, updating
+from ..util import PARAM_NAME_PATTERN, escape, updating
 from ..util.warnings import deprecated
 from ..viewable import Viewable
 from .base import Widget
@@ -171,16 +171,18 @@ class LoadingSpinner(BooleanIndicator):
     def _process_param_change(self, msg):
         msg = super()._process_param_change(msg)
         if 'text' in msg:
-            msg['text'] = escape(f'<span><b>{msg["text"]}</b></span>')
+            text = msg.pop('text')
+            if not PARAM_NAME_PATTERN.match(text):
+                msg['text'] = escape(f'<span><b>{text}</b></span>')
         value = msg.pop('value', None)
         color = msg.pop('color', None)
         bgcolor = msg.pop('bgcolor', None)
         if msg.get('sizing_mode') == 'fixed':
             msg['sizing_mode'] = None
-        if 'size' in msg or 'height' in msg:
+        if 'size' in msg or 'height' in msg or 'stylesheets' in msg:
             if 'width' in msg and msg['width'] == msg.get('height'):
                 del msg['width']
-            size = int(min(msg.pop('height', float('inf')), msg.pop('size', 125)))
+            size = int(min(msg.pop('height', self.height) or float('inf'), msg.pop('size', self.size)))
             msg['stylesheets'] = ([f':host {{ --loading-spinner-size: {size}px; }}'] +
                                   msg.get('stylesheets', []))
             msg['min_width'] = msg['min_height'] = size