Qt4: textedit improvements

This patch sets the default document type in the "File save" dialog to
HTML and makes both the "File open" and "File save" dialogs enter the "/"
directory by default.

Fixes #274.

qt4/src/lib/qt4/textedit_example.patch

@@ -11,6 +11,33 @@ diff --git a/demos/textedit/main.cpp b/demos/textedit/main.cpp
      mw.show();
      return a.exec();
  }
+diff --git a/demos/textedit/textedit.cpp b/demos/textedit/textedit.cpp
+--- a/demos/textedit/textedit.cpp
++++ b/demos/textedit/textedit.cpp
+@@ -463,7 +463,7 @@
+ void TextEdit::fileOpen()
+ {
+     QString fn = QFileDialog::getOpenFileName(this, tr("Open File..."),
+-                                              QString(), tr("HTML-Files (*.htm *.html);;All Files (*)"));
++                                              QString("/"), tr("HTML-Files (*.htm *.html);;All Files (*)"));
+     if (!fn.isEmpty())
+         load(fn);
+ }
+@@ -483,11 +483,11 @@
+ bool TextEdit::fileSaveAs()
+ {
+     QString fn = QFileDialog::getSaveFileName(this, tr("Save as..."),
+-                                              QString(), tr("ODF files (*.odt);;HTML-Files (*.htm *.html);;All Files (*)"));
++                                              QString("/"), tr("HTML-Files (*.htm *.html);;All Files (*)"));
+     if (fn.isEmpty())
+         return false;
+-    if (! (fn.endsWith(".odt", Qt::CaseInsensitive) || fn.endsWith(".htm", Qt::CaseInsensitive) || fn.endsWith(".html", Qt::CaseInsensitive)) )
+-        fn += ".odt"; // default
++    if (! (fn.endsWith(".htm", Qt::CaseInsensitive) || fn.endsWith(".html", Qt::CaseInsensitive)) )
++        fn += ".html"; // default
+     setCurrentFileName(fn);
+     return fileSave();
+ }
 diff --git a/demos/textedit/textedit.pro b/demos/textedit/textedit.pro
 --- a/demos/textedit/textedit.pro
 +++ b/demos/textedit/textedit.pro