fix: Homeserver readonly if conifg wants it

lib/components/default_app_bar_search_field.dart

@@ -8,6 +8,7 @@ class DefaultAppBarSearchField extends StatefulWidget {
   final String prefixText;
   final String hintText;
   final EdgeInsets padding;
+  final bool readOnly;
 
   const DefaultAppBarSearchField({
     Key key,
@@ -18,6 +19,7 @@ class DefaultAppBarSearchField extends StatefulWidget {
     this.prefixText,
     this.hintText,
     this.padding,
+    this.readOnly = false,
   }) : super(key: key);
 
   @override
@@ -71,6 +73,7 @@ class _DefaultAppBarSearchFieldState extends State<DefaultAppBarSearchField> {
           controller: _searchController,
           onChanged: widget.onChanged,
           focusNode: _focusNode,
+          readOnly: widget.readOnly,
           decoration: InputDecoration(
             prefixText: widget.prefixText,
             contentPadding: EdgeInsets.only(
@@ -82,9 +85,10 @@ class _DefaultAppBarSearchFieldState extends State<DefaultAppBarSearchField> {
               borderRadius: BorderRadius.circular(32),
             ),
             hintText: widget.hintText,
-            suffixIcon: _focusNode.hasFocus ||
-                    (widget.suffix == null &&
-                        (_searchController.text?.isNotEmpty ?? false))
+            suffixIcon: !widget.readOnly &&
+                    (_focusNode.hasFocus ||
+                        (widget.suffix == null &&
+                            (_searchController.text?.isNotEmpty ?? false)))
                 ? IconButton(
                     icon: Icon(Icons.backspace_outlined),
                     onPressed: () {

lib/views/homeserver_picker.dart

@@ -71,6 +71,7 @@ class _HomeserverPickerState extends State<HomeserverPicker> {
           suffix: Icon(Icons.edit_outlined),
           padding: padding,
           onChanged: (s) => _domain = s,
+          readOnly: !AppConfig.allowOtherHomeservers,
         ),
         elevation: 0,
       ),