css: Remove support for legacy desktop app.

We haven't seen significant traffic from the legacy desktop app in
over a year, and users using it get a warning to upgrade since last
summer, so it's probably OK to stop providing special fonts for it.

templates/zerver/app/index.html

@@ -29,12 +29,8 @@
 
     </style>
 
-    {% if nofontface %}
-    {# We can't use @font-face on qtwebkit, so use differently minified CSS #}
-    {% stylesheet 'app-fontcompat' %}
-    {% else %}
     {% stylesheet 'app' %}
-    {% endif %}
+
     {{ minified_js('app', csp_nonce)|safe }}
 
     {{ render_bundle('translations', attrs='nonce="%s"' % (csp_nonce)) }}

zerver/views/home.py

@@ -243,7 +243,6 @@ def home_real(request: HttpRequest) -> HttpResponse:
                       context={'user_profile': user_profile,
                                'page_params': JSONEncoderForHTML().encode(page_params),
                                'csp_nonce': csp_nonce,
-                               'nofontface': is_buggy_ua(request.META.get("HTTP_USER_AGENT", "Unspecified")),
                                'avatar_url': avatar_url(user_profile),
                                'show_debug':
                                settings.DEBUG and ('show_debug' in request.GET),
@@ -265,13 +264,3 @@ def apps_view(request: HttpRequest, _: str) -> HttpResponse:
     if settings.ZILENCER_ENABLED:
         return render(request, 'zerver/apps.html')
     return HttpResponseRedirect('https://zulipchat.com/apps/', status=301)
-
-def is_buggy_ua(agent: str) -> bool:
-    """Discrimiate CSS served to clients based on User Agent
-
-    Due to QTBUG-3467, @font-face is not supported in QtWebKit.
-    This may get fixed in the future, but for right now we can
-    just serve the more conservative CSS to all our desktop apps.
-    """
-    return ("Zulip Desktop/" in agent or "ZulipDesktop/" in agent) and \
-        "Mac" not in agent

zproject/settings.py

@@ -896,39 +896,6 @@ PIPELINE = {
             ),
             'output_filename': 'min/landing.css'
         },
-        # Two versions of the app CSS exist because of QTBUG-3467
-        'app-fontcompat': {
-            'source_filenames': (
-                'third/bootstrap-notify/css/bootstrap-notify.css',
-                'third/spectrum/spectrum.css',
-                'third/thirdparty-fonts.css',
-                'generated/icons/style.css',
-                'node_modules/flatpickr/dist/flatpickr.css',
-                'node_modules/flatpickr/dist/plugins/confirmDate/confirmDate.css',
-                'styles/components.css',
-                'styles/app_components.css',
-                'styles/zulip.css',
-                'styles/alerts.css',
-                'styles/settings.css',
-                'styles/subscriptions.css',
-                'styles/drafts.css',
-                'styles/input_pill.css',
-                'styles/informational-overlays.css',
-                'styles/compose.css',
-                'styles/reactions.css',
-                'styles/left-sidebar.css',
-                'styles/right-sidebar.css',
-                'styles/lightbox.css',
-                'styles/popovers.css',
-                'styles/pygments.css',
-                'styles/media.css',
-                'styles/typing_notifications.css',
-                'styles/hotspots.css',
-                'styles/night_mode.css',
-                # We don't want fonts.css on QtWebKit, so its omitted here
-            ),
-            'output_filename': 'min/app-fontcompat.css'
-        },
         'app': {
             'source_filenames': (
                 'third/bootstrap-notify/css/bootstrap-notify.css',