devices widget: open file manager on dispvm block attach

 Uses new_dispvm.log for
logging, consistent with existing patterns in the codebase.

Fixes QubesOS/qubes-issues#10709

Author: Sahilll10

qui/devices/actionable_widgets.py

@@ -31,6 +31,7 @@
 import qubesadmin
 import qubesadmin.devices
 import qubesadmin.vm
+from qubesadmin import exc
 
 import gi
 
@@ -41,6 +42,7 @@
 import time
 
 
+
 def load_icon(icon_name: str, backup_name: str, size: int = 24):
     """Load icon from provided name/path, if available. If not, load backup
     icon. If icon not found in any of the above ways, load a blank icon of
@@ -324,6 +326,19 @@ async def widget_action(self, *_args):
 
         self.device.attach_to_vm(backend.VM(new_dispvm))
 
+        if self.device.device_class == "block":
+            try:
+                new_dispvm.run_service(
+                    "qubes.StartApp+qubes-open-file-manager",
+                    wait=False,
+                )
+            except exc.QubesException as ex:
+                new_dispvm.log.exception(
+                    "Failed to open file manager in %s: %s",
+                    new_dispvm.name,
+                    ex,
+                )
+
 
 class DetachAndAttachDisposableWidget(ActionableWidget, VMWithIcon):
     """Detach from all current attachments and attach to new disposable"""
@@ -340,6 +355,19 @@ async def widget_action(self, *_args):
 
         self.device.attach_to_vm(backend.VM(new_dispvm))
 
+        if self.device.device_class == "block":
+            try:
+                new_dispvm.run_service(
+                    "qubes.StartApp+qubes-open-file-manager",
+                    wait=False,
+                )
+            except exc.QubesException as ex:
+                new_dispvm.log.exception(
+                    "Failed to open file manager in %s: %s",
+                    new_dispvm.name,
+                    ex,
+                )
+
 
 class ToggleFeatureItem(ActionableWidget, SimpleActionWidget):
     def __init__(