open file dialog in folder of currently open file

tabs.py

@@ -1,5 +1,5 @@
 import os
-from typing import Mapping
+from typing import Mapping, Optional
 
 from PyQt6.QtWidgets import *
 from PyQt6.QtCore import *
@@ -13,7 +13,6 @@ from settings import Settings
 
 
 class Tabs(QWidget):
-    tabs_by_index = {}
     tabs_by_filename = {}
 
     def __init__(self, settings: Settings):
@@ -69,3 +68,13 @@ class Tabs(QWidget):
     def destruct(self):
         while self.tabs.count() > 0:
             self._close_tab(0)
+
+    def _current_tab(self) -> int:
+        return self.tabs.currentIndex()
+
+    def current_file(self) -> Optional[str]:
+        if self.tabs.currentIndex() < 0:
+            return None
+
+        full_tab: FullTabWidget = self.tabs.widget(self.tabs.currentIndex())
+        return full_tab.get_file()