support ctrl + a

bigtext.py

@@ -50,9 +50,6 @@ class FileWatchdogThread(QRunnable):
         self.big_text = big_text
 
     def run(self) -> None:
-        print("observer started for file ", self.file)
-        if self.observer:
-            print("observer already exists")
         self.observer = Observer()
         self.observer.schedule(FileObserver(self.big_text), self.file)
         self.observer.start()
@@ -140,12 +137,16 @@ class InnerBigText(QWidget):
                 self.scroll_by_lines(-lines_to_scroll)
             if e.key() == Qt.Key.Key_PageDown:
                 self.scroll_by_lines(lines_to_scroll)
-            if e.key() == 16777235:
+            if e.key() == 16777235: # page up
                 self.scroll_by_lines(-3)
-            if e.key() == 16777237:
+            if e.key() == 16777237: # page down
                 self.scroll_by_lines(3)
-        if e.modifiers() == Qt.KeyboardModifier.ControlModifier and e.key() == 67:  # 67 == 'c'
+        if e.modifiers() == Qt.KeyboardModifier.ControlModifier and e.key() == 67:  # ctrl + c
             self.copy_selection()
+        if e.modifiers() == Qt.KeyboardModifier.ControlModifier and e.key() == 65:  # ctrl + a
+            self.selection_highlight.start_byte = 0
+            self.selection_highlight.end_byte = self.model.byte_count()
+            self.update()
 
     def wheelEvent(self, event: QWheelEvent):
         direction = 1 if event.angleDelta().y() < 0 else -1