ui:use appimages pattern as default target if found

If the path of a process starts with /tmp/.mount_*, which is the common
path for appimages, use it as the default target on the popups.

Previously it was only added to the list of targets, but preselecting it
will help users to create rules for appimages.

(cherry picked from commit 016f484)

ui/opensnitch/dialogs/prompt.py

@@ -324,6 +324,20 @@ def _set_app_args(self, app_name, app_args):
             self.argsLabel.setVisible(False)
             self.argsLabel.setText("")
 
+    def _set_default_target(self, combo, con, app_name, app_args):
+        # set appimage as default target if the process path starts with
+        # /tmp/._mount
+        if con.process_path.startswith(self.APPIMAGE_PREFIX):
+            idx = combo.findData(self.FIELD_APPIMAGE)
+            if idx != -1:
+                combo.setCurrentIndex(idx)
+                return
+
+        if int(con.process_id) > 0 and app_name != "" and app_args != "":
+            self.whatCombo.setCurrentIndex(int(self._cfg.getSettings(self._cfg.DEFAULT_TARGET_KEY)))
+        else:
+            self.whatCombo.setCurrentIndex(2)
+
     def _render_connection(self, con):
         app_name, app_icon, description, _ = self._apps_parser.get_info_by_path(con.process_path, "terminal")
         app_args = " ".join(con.process_args)
@@ -415,11 +429,7 @@ def _render_connection(self, con):
 
         self._configure_default_duration()
 
-        if int(con.process_id) > 0 and app_name != "" and app_args != "":
-            self.whatCombo.setCurrentIndex(int(self._cfg.getSettings(self._cfg.DEFAULT_TARGET_KEY)))
-        else:
-            self.whatCombo.setCurrentIndex(2)
-
+        self._set_default_target(self.whatCombo, con, app_name, app_args)
 
         self.checkDstIP.setChecked(self._cfg.getBool(self._cfg.DEFAULT_POPUP_ADVANCED_DSTIP))
         self.checkDstPort.setChecked(self._cfg.getBool(self._cfg.DEFAULT_POPUP_ADVANCED_DSTPORT))
@@ -444,7 +454,7 @@ def closeEvent(self, e):
         e.ignore()
 
     def _add_appimage_pattern_to_combo(self, combo, con):
-        """appimages' absolute path usually starts with /tmp/.mount_<
+        """appimages' absolute path usually starts with /tmp/.mount_
         """
         appimage_bin = os.path.basename(con.process_path)
         appimage_path = os.path.dirname(con.process_path)