When possible, install add-on before add-ons are loaded

Removes the need to restart Anki if it is not running when
user launches .ankiaddon file

qt/aqt/addons.py

@@ -859,18 +859,19 @@ class ConfigEditor(QDialog):
 def installAddonPackages(
     addonsManager: AddonManager,
     paths: List[str],
-    parent: QWidget = None,
+    parent: Optional[QWidget] = None,
-    external: bool = False,
+    warn: bool = False,
+    strictly_modal: bool = False
 ) -> bool:
 
-    if external:
+    if warn:
         names = ",<br>".join(f"<b>{os.path.basename(p)}</b>" for p in paths)
         q = _(
             "<b>Important</b>: As add-ons are programs downloaded from the internet, "
             "they are potentially malicious."
             "<b>You should only install add-ons you trust.</b><br><br>"
             "Are you sure you want to proceed with the installation of the "
-            "following add-on(s)?<br><br>%(names)s"
+            "following Anki add-on(s)?<br><br>%(names)s"
         ) % dict(names=names)
         if (
             not showInfo(
@@ -888,11 +889,7 @@ def installAddonPackages(
 
     if log:
         log_html = "<br>".join(log)
-        if external:
+        if len(log) == 1 and not strictly_modal:
-            log_html += "<br><br>" + _(
-                "<b>Please restart Anki to complete the installation.</b>"
-            )
-        if len(log) == 1:
             tooltip(log_html, parent=parent)
         else:
             showInfo(

qt/aqt/main.py

@@ -72,7 +72,7 @@ class AnkiQt(QMainWindow):
         self.safeMode = self.app.queryKeyboardModifiers() & Qt.ShiftModifier
         try:
             self.setupUI()
-            self.setupAddons()
+            self.setupAddons(args)
         except:
             showInfo(_("Error during startup:\n%s") % traceback.format_exc())
             sys.exit(1)
@@ -85,7 +85,7 @@ class AnkiQt(QMainWindow):
                 )
             )
         # were we given a file to import?
-        if args and args[0]:
+        if args and args[0] and not self._isAddon(args[0]):
             self.onAppMsg(args[0])
         # Load profile in a timer so we can let the window finish init and not
         # close on profile load error.
@@ -750,10 +750,14 @@ title="%s" %s>%s</button>""" % (
 
         self.errorHandler = aqt.errors.ErrorHandler(self)
 
-    def setupAddons(self) -> None:
+    def setupAddons(self, args: Optional[List]) -> None:
         import aqt.addons
 
         self.addonManager = aqt.addons.AddonManager(self)
+
+        if args and args[0] and self._isAddon(args[0]):
+            self.installAddon(args[0], startup=True)
+
         if not self.safeMode:
             self.addonManager.loadAddons()
 
@@ -1028,10 +1032,14 @@ QTreeWidget {
     # Installing add-ons from CLI / mimetype handler
     ##########################################################################
 
-    def installAddon(self, path):
+    def installAddon(self, path: str, startup: bool = False):
         from aqt.addons import installAddonPackages
 
-        installAddonPackages(self.addonManager, [path], external=True, parent=self)
+        parent = None if startup else self
+
+        installAddonPackages(
+            self.addonManager, [path], warn=True, strictly_modal=startup, parent=parent
+        )
 
     # Cramming
     ##########################################################################