Move "open" from IEditor to IDocument

For non-editor documents it currently is not used, but for editors it
makes more sense to have that on the document instead of the editor.
Most actual implementations of "open" were done in the documents already
anyhow, because it is needed for reloading.

Change-Id: I29d4df2078995cbe80172b51a9bebeecb3afad3c
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>

src/plugins/tasklist/taskfile.cpp

@@ -94,11 +94,12 @@ bool TaskFile::reload(QString *errorString, ReloadFlag flag, ChangeType type)
         deleteLater();
         return true;
     }
-    return open(errorString, filePath().toString());
+    return open(errorString, filePath().toString(), filePath().toString());
 }
 
-bool TaskFile::open(QString *errorString, const QString &fileName)
+bool TaskFile::open(QString *errorString, const QString &fileName, const QString &realFileName)
 {
+    Q_UNUSED(realFileName)
     setFilePath(Utils::FileName::fromString(fileName));
     return TaskListPlugin::loadFile(errorString, m_baseDir, fileName);
 }

src/plugins/tasklist/taskfile.h

@@ -55,7 +55,7 @@ public:
     ReloadBehavior reloadBehavior(ChangeTrigger state, ChangeType type) const;
     bool reload(QString *errorString, ReloadFlag flag, ChangeType type);
 
-    bool open(QString *errorString, const QString &fileName);
+    bool open(QString *errorString, const QString &fileName, const QString &realFileName);
 
     QString baseDir() const;
     void setBaseDir(const QString &base);

src/plugins/tasklist/tasklistplugin.cpp

@@ -177,7 +177,7 @@ IDocument *TaskListPlugin::openTasks(const QString &base, const QString &fileNam
     file->setBaseDir(base);
 
     QString errorString;
-    if (!file->open(&errorString, fileName)) {
+    if (!file->open(&errorString, fileName, fileName)) {
         QMessageBox::critical(ICore::mainWindow(), tr("File Error"), errorString);
         delete file;
         return 0;