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/vcsbase/submiteditorfile.cpp

@@ -57,6 +57,24 @@ SubmitEditorFile::SubmitEditorFile(const VcsBaseSubmitEditorParameters *paramete
     setTemporary(true);
 }
 
+bool SubmitEditorFile::open(QString *errorString, const QString &fileName, const QString &realFileName)
+{
+    if (fileName.isEmpty())
+        return false;
+
+    FileReader reader;
+    if (!reader.fetch(realFileName, QIODevice::Text, errorString))
+        return false;
+
+    const QString text = QString::fromLocal8Bit(reader.data());
+    if (!m_editor->setFileContents(text.toUtf8()))
+        return false;
+
+    setFilePath(FileName::fromString(fileName));
+    setModified(fileName != realFileName);
+    return true;
+}
+
 bool SubmitEditorFile::setContents(const QByteArray &contents)
 {
     return m_editor->setFileContents(contents);