Remove superfluous spaces in diagnostic messages

See valentjn/vscode-ltex#221.

CHANGELOG.md

@@ -13,6 +13,7 @@
 - Add support for [GitLab Flavored Markdown](https://gitlab.com/gitlab-org/gitlab/blob/master/doc/user/markdown.md), especially inline math (e.g., ``$`E = mc^2`$``)
 - Add support for Markdown tables as in [GitHub Flavored Markdown](https://github.github.com/gfm/#tables-extension-)
 - Enable `Add to dictionary` quick fix for Slovak rule IDs `MUZSKY_ROD_NEZIV_A`, `ZENSKY_ROD_A`, and `STREDNY_ROD_A` (fixes [vscode-ltex#221](https://github.com/valentjn/vscode-ltex/issues/221))
+- Remove superfluous spaces in messages of diagnostics
 - Use Flexmark's YAML Front Matter extension to ignore YAML front matter in Markdown instead of own handling
 - Print Flexmark AST of Markdown documents to log when [`ltex.ltex-ls.logLevel`](https://valentjn.github.io/vscode-ltex/docs/settings.html#ltexltex-lsloglevel) is `"finest"`
 

ltexls-core/src/main/java/org/bsplines/ltexls/languagetool/LanguageToolRuleMatch.java

@@ -9,6 +9,7 @@
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.regex.Pattern;
 import org.bsplines.ltexls.parsing.AnnotatedTextFragment;
 import org.bsplines.ltexls.server.LtexTextDocumentItem;
 import org.bsplines.ltexls.tools.Tools;
@@ -19,6 +20,8 @@
 import org.languagetool.rules.RuleMatch;
 
 public class LanguageToolRuleMatch {
+  private static final Pattern twoOrMoreSpacesPattern = Pattern.compile("[ \n]{2,}");
+
   private @MonotonicNonNull String ruleId;
   private @MonotonicNonNull String sentence;
   private int fromPos;
@@ -47,6 +50,8 @@ public LanguageToolRuleMatch(@Nullable String ruleId, @Nullable String sentence,
       String unknownWord = annotatedTextFragment.getSubstringOfPlainText(fromPos, toPos);
       this.message = "'" + unknownWord + "': " + this.message;
     }
+
+    this.message = twoOrMoreSpacesPattern.matcher(message).replaceAll(" ").trim();
   }
 
   public @Nullable String getRuleId() {