Fix single-line brace formatting to preserve internal whitespace

The formatter now calculates and passes explicit leading and trailing whitespace around expression content to the `_brace` method. This ensures correct rendering of single-line expressions that include braces.

CHANGELOG.md

@@ -17,3 +17,7 @@
 ## [2026.6.100]
 
 - Fix several bugs
+
+## [2026.6.200]
+
+- Fix foramtting bug

server/src/lsp_tclserver.py

@@ -98,8 +98,12 @@ class TclLanguageServer(server.LanguageServer):
             FormatterOpts(
                 indent=indent,
                 spaces_in_braces=False,
+                balanced_spaces_in_braces=False,
                 max_blank_lines=500,
                 indent_namespace_eval=True,
+                indent_mixed_tab_size=0,
+                emacs=False,
+                debug_whitespace=False,
             ),
         )
 

server/src/tools/formatter.py

@@ -26,6 +26,8 @@ class NxFormatter(BaseFormatter):
                 formatted += [line]
 
         if expr.pos[0] == expr.end_pos[0]:
-            return self._brace(formatted)
+            space_before = expr.children[0].pos[1] - expr.pos[1] - 1
+            space_after = expr.end_pos[1] - expr.children[-1].end_pos[1] - 1
+            return self._brace(formatted, (space_before, space_after))
 
         return ["{"] + self._indent(formatted, self.opts.indent) + ["}"]