Restore look & feel for toggle buttons

lib/src/widgets/toolbar/buttons/clear_format_button.dart

@@ -107,11 +107,14 @@ class QuillToolbarClearFormatButton extends StatelessWidget {
     final theme = Theme.of(context);
 
     final iconColor = iconTheme?.iconUnselectedColor ?? theme.iconTheme.color;
+    final fillColor = iconTheme?.iconUnselectedFillColor ?? theme.canvasColor;
 
     return QuillToolbarIconButton(
       tooltip: tooltip,
-      icon: Icon(iconData, size: iconSize * iconButtonFactor, color: iconColor),
+      size: iconSize * iconButtonFactor,
+      icon: Icon(iconData, size: iconSize, color: iconColor),
       isFilled: false,
+      iconFilledStyle: IconButton.styleFrom(backgroundColor: fillColor),
       onPressed: _sharedOnPressed,
       afterPressed: afterButtonPressed,
     );

lib/src/widgets/toolbar/buttons/color/color_button.dart

@@ -200,7 +200,7 @@ class QuillToolbarColorButtonState extends State<QuillToolbarColorButton> {
       icon: Icon(iconData,
           size: iconSize,
           color: widget.isBackground ? iconColorBackground : iconColor),
-      isFilled: false,
+      isFilled: _isToggledColor || _isToggledBackground,
       iconFilledStyle: IconButton.styleFrom(
           backgroundColor:
               widget.isBackground ? fillColorBackground : fillColor),

lib/src/widgets/toolbar/buttons/link_style2_button.dart

@@ -148,14 +148,19 @@ class _QuillToolbarLinkStyleButton2State
     final isToggled = _getLinkAttributeValue() != null;
     return QuillToolbarIconButton(
       tooltip: tooltip,
+      size: iconSize * iconButtonFactor,
       icon: Icon(
         iconData,
-        size: iconSize * iconButtonFactor,
+        size: iconSize,
         color: isToggled
             ? (iconTheme?.iconSelectedColor ?? theme.primaryIconTheme.color)
             : (iconTheme?.iconUnselectedColor ?? theme.iconTheme.color),
       ),
       isFilled: isToggled,
+      iconFilledStyle: IconButton.styleFrom(
+          backgroundColor: isToggled
+              ? (iconTheme?.iconSelectedFillColor ?? theme.primaryColor)
+              : (iconTheme?.iconUnselectedFillColor ?? theme.canvasColor)),
       onPressed: _openLinkDialog,
       afterPressed: afterButtonPressed,
     );

lib/src/widgets/toolbar/buttons/link_style_button.dart

@@ -140,14 +140,19 @@ class QuillToolbarLinkStyleButtonState
     final theme = Theme.of(context);
     return QuillToolbarIconButton(
       tooltip: tooltip,
+      size: iconSize * iconButtonFactor,
       icon: Icon(
         iconData,
-        size: iconSize * iconButtonFactor,
+        size: iconSize,
         color: isToggled
             ? (iconTheme?.iconSelectedColor ?? theme.primaryIconTheme.color)
             : (iconTheme?.iconUnselectedColor ?? theme.iconTheme.color),
       ),
       isFilled: isToggled,
+      iconFilledStyle: IconButton.styleFrom(
+          backgroundColor: isToggled
+              ? (iconTheme?.iconSelectedFillColor ?? theme.primaryColor)
+              : (iconTheme?.iconUnselectedFillColor ?? theme.canvasColor)),
       onPressed: () => _openLinkDialog(context),
       afterPressed: afterButtonPressed,
     );