Fix autocomplete thread

CHANGELOG.md

@@ -57,7 +57,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 - We fixed an issue where the Preferences entry preview will be unexpected modified leads to Value too long exception [#6198](https://github.com/JabRef/jabref/issues/6198)
 - We fixed an issue where custom jstyles for Open/LibreOffice would only be valid if a layout line for the entry type `default` was at the end of the layout section [#6303](https://github.com/JabRef/jabref/issues/6303)
 - We fixed an issue where sort on numeric cases was broken. [#6349](https://github.com/JabRef/jabref/issues/6349)
-
+- We fixed an issue where an "Not on FX thread" exception occured when saving on linux [#6453](https://github.com/JabRef/jabref/issues/6453)
 
 ### Removed
 

build.gradle

@@ -543,7 +543,7 @@ task deleteInstallerTemp(type: Delete) {
 
 jpackage.dependsOn deleteInstallerTemp
 jlink {
-    options = ['--strip-debug','--compress', '2', '--no-header-files', '--no-man-pages']
+    options = ['--strip-debug', '--compress', '2', '--no-header-files', '--no-man-pages']
     launcher {
         name = 'JabRef'
     }

src/main/java/org/jabref/gui/autocompleter/AutoCompletionTextInputBinding.java

@@ -33,6 +33,8 @@
 import javafx.util.Callback;
 import javafx.util.StringConverter;
 
+import org.jabref.gui.util.DefaultTaskExecutor;
+
 import org.controlsfx.control.textfield.AutoCompletionBinding;
 
 /**
@@ -98,7 +100,7 @@ private AutoCompletionTextInputBinding(final TextInputControl textInputControl,
     }
 
     private static <T> StringConverter<T> defaultStringConverter() {
-        return new StringConverter<T>() {
+        return new StringConverter<>() {
             @Override
             public String toString(T t) {
                 return t == null ? null : t.toString();
@@ -133,7 +135,7 @@ private void setUserInputText(String newText) {
             newText = "";
         }
         AutoCompletionInput input = inputAnalyzer.analyze(newText);
-        setUserInput(input.getUnfinishedPart());
+        DefaultTaskExecutor.runInJavaFXThread(() -> setUserInput(input.getUnfinishedPart()));
     }
 
     @Override

src/main/java/org/jabref/gui/fieldeditors/SimpleEditor.java

@@ -33,10 +33,12 @@ public SimpleEditor(final Field field,
         ((ContextMenuAddable) textInput).addToContextMenu(EditorMenus.getDefaultMenu(textInput));
         this.getChildren().add(textInput);
 
-        AutoCompletionTextInputBinding<?> autoCompleter = AutoCompletionTextInputBinding.autoComplete(textInput, viewModel::complete, viewModel.getAutoCompletionStrategy());
-        if (suggestionProvider instanceof ContentSelectorSuggestionProvider) {
-            // If content selector values are present, then we want to show the auto complete suggestions immediately on focus
-            autoCompleter.setShowOnFocus(true);
+        if (!isMultiLine) {
+            AutoCompletionTextInputBinding<?> autoCompleter = AutoCompletionTextInputBinding.autoComplete(textInput, viewModel::complete, viewModel.getAutoCompletionStrategy());
+            if (suggestionProvider instanceof ContentSelectorSuggestionProvider) {
+                // If content selector values are present, then we want to show the auto complete suggestions immediately on focus
+                autoCompleter.setShowOnFocus(true);
+            }
         }
 
         new EditorValidator(preferences).configureValidation(viewModel.getFieldValidator().getValidationStatus(), textInput);