Fix: do not scroll right by default in dataforms/bookmark text

Seeing "…@muc.example.com" instead of "toto@muc.…" is not really
helpful, especially in bookmarks.

poezio/windows/bookmark_forms.py

@@ -19,7 +19,8 @@ class BookmarkNameInput(FieldInput, Input):
         FieldInput.__init__(self, field)
         Input.__init__(self)
         self.text = field.name
-        self.pos = len(self.text)
+        self.pos = 0
+        self.view_pos = 0
         self.color = get_theme().COLOR_NORMAL_TEXT
 
     def save(self) -> None:
@@ -39,7 +40,8 @@ class BookmarkJIDInput(FieldInput, Input):
             jid = JID('')
         jid.resource = field.nick or None
         self.text = jid.full
-        self.pos = len(self.text)
+        self.pos = 0
+        self.view_pos = 0
         self.color = get_theme().COLOR_NORMAL_TEXT
 
     def save(self) -> None:

poezio/windows/data_forms.py

@@ -330,7 +330,8 @@ class TextSingleWin(FieldInputMixin, Input):
         Input.__init__(self)
         self.text = field.get_value() if isinstance(field.get_value(), str)\
             else ""
-        self.pos = len(self.text)
+        self.pos = 0
+        self.view_pos = 0
         self.color = get_theme().COLOR_NORMAL_TEXT
 
     def reply(self):