[FIX] use read/write state of wrapped TextEditorProvider

Fixes #66

Author: Sommer

build.gradle

@@ -10,7 +10,7 @@ buildscript {
 }
 
 plugins {
-    id 'org.jetbrains.intellij' version '0.3.1'
+    id 'org.jetbrains.intellij' version '0.3.12'
     id 'jacoco'
     id 'com.github.kt3k.coveralls' version '2.8.2'
 }
@@ -68,7 +68,7 @@ idea {
 apply plugin: 'org.jetbrains.intellij'
 intellij {
     // IDE version - https://www.jetbrains.com/intellij-repository/releases
-    version = System.getenv().getOrDefault('IDEA_VERSION', 'IC-2018.1')
+    version = System.getenv().getOrDefault('IDEA_VERSION', 'IC-2018.2.4')
     pluginName = 'CSV Plugin'
     instrumentCode = true
     updateSinceUntilBuild = false

src/main/java/net/seesharpsoft/intellij/plugins/csv/editor/CsvFileEditorProvider.java

@@ -1,16 +1,15 @@
 package net.seesharpsoft.intellij.plugins.csv.editor;
 
 import com.intellij.openapi.editor.EditorSettings;
-import com.intellij.openapi.fileEditor.FileEditor;
-import com.intellij.openapi.fileEditor.FileEditorPolicy;
-import com.intellij.openapi.fileEditor.FileEditorProvider;
-import com.intellij.openapi.fileEditor.TextEditor;
+import com.intellij.openapi.fileEditor.*;
 import com.intellij.openapi.fileEditor.impl.text.TextEditorProvider;
 import com.intellij.openapi.fileTypes.LanguageFileType;
 import com.intellij.openapi.project.Project;
+import com.intellij.openapi.util.Disposer;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.psi.SingleRootFileViewProvider;
 import net.seesharpsoft.intellij.plugins.csv.CsvLanguage;
+import org.jdom.Element;
 import org.jetbrains.annotations.NotNull;
 
 public class CsvFileEditorProvider implements FileEditorProvider {
@@ -50,4 +49,19 @@ public FileEditor createEditor(@NotNull Project project, @NotNull VirtualFile vi
         return textEditor;
     }
 
+    @Override
+    public FileEditorState readState(@NotNull Element sourceElement, @NotNull Project project, @NotNull VirtualFile file) {
+        return TextEditorProvider.getInstance().readState(sourceElement, project, file);
+    }
+
+    @Override
+    public void writeState(@NotNull FileEditorState state, @NotNull Project project, @NotNull Element targetElement) {
+        TextEditorProvider.getInstance().writeState(state, project, targetElement);
+    }
+
+    @Override
+    public void disposeEditor(@NotNull FileEditor editor) {
+        TextEditorProvider.getInstance().disposeEditor(editor);
+    }
+    
 }