qutebrowser: repair vandalism

Our qutebrowser package has been vandalized by various commits, such
as c9cc3a2e3e and
ad0bbaf1d2, which made erroneous
assertions such as "since qutebrowser 3.0.0 the derivation is only
building for qt6."

This commit repairs the vandalism.

pkgs/applications/networking/browsers/qutebrowser/default.nix

@@ -15,6 +15,7 @@
 }:
 
 let
+  isQt6 = lib.versions.major qtbase.version == "6";
   pdfjs = let
     version = "3.9.179";
   in
@@ -50,10 +51,14 @@ python3.pkgs.buildPythonApplication {
   ];
 
   propagatedBuildInputs = with python3.pkgs; ([
-    pyyaml pyqt6-webengine jinja2 pygments
+    pyyaml (if isQt6 then pyqt6-webengine else pyqtwebengine) jinja2 pygments
     # scripts and userscripts libs
     tldextract beautifulsoup4
-    readability-lxml pykeepass stem
+    readability-lxml pykeepass
+  ] ++ lib.optionals ((builtins.tryEval stem.outPath).success) [
+    # error: stem-1.8.2 not supported for interpreter python3.11
+    stem
+  ] ++ [
     pynacl
     # extensive ad blocking
     adblock

pkgs/development/libraries/qt-5/5.15/default.nix

@@ -339,5 +339,6 @@ let
 
   finalScope = baseScope.overrideScope(final: prev: {
     qttranslations = bootstrapScope.qttranslations;
+    qutebrowser = final.callPackage ../../../../applications/networking/browsers/qutebrowser { };
   });
 in finalScope