Fix the window.hide_wayland_decoration setting

Fixes #2267

doc/changelog.asciidoc

@@ -94,6 +94,7 @@ Fixes
   insert mode anymore.
 - The keybinding help widget now works correctly when using keybindings with a
   count.
+- The `window.hide_wayland_decoration setting now works correctly again.
 
 v0.11.1 (unreleased)
 --------------------

qutebrowser/app.py

@@ -473,10 +473,6 @@ def _init_modules(args, crash_handler):
     objreg.register('cache', diskcache)
 
     log.init.debug("Misc initialization...")
-    if config.val.window.hide_wayland_decoration:
-        os.environ['QT_WAYLAND_DISABLE_WINDOWDECORATION'] = '1'
-    else:
-        os.environ.pop('QT_WAYLAND_DISABLE_WINDOWDECORATION', None)
     macros.init()
     # Init backend-specific stuff
     browsertab.init()

qutebrowser/config/configinit.py

@@ -80,6 +80,11 @@ def early_init(args):
             config.val.force_software_rendering):
         os.environ['QT_XCB_FORCE_SOFTWARE_OPENGL'] = '1'
 
+    if config.val.window.hide_wayland_decoration:
+        os.environ['QT_WAYLAND_DISABLE_WINDOWDECORATION'] = '1'
+    else:
+        os.environ.pop('QT_WAYLAND_DISABLE_WINDOWDECORATION', None)
+
 
 def get_backend(args):
     """Find out what backend to use based on available libraries."""

tests/unit/config/test_configinit.py

@@ -209,6 +209,23 @@ class TestEarlyInit:
 
         assert os.environ[envvar] == '1'
 
+    @pytest.mark.parametrize('old', ['1', '0', None])
+    @pytest.mark.parametrize('configval', [True, False])
+    def test_hide_wayland_decoration(self, monkeypatch, init_patch, args,
+                                     old, configval):
+        envvar = 'QT_WAYLAND_DISABLE_WINDOWDECORATION'
+        if old is None:
+            monkeypatch.delenv(envvar, raising=False)
+        else:
+            monkeypatch.setenv(envvar, old)
+
+        args.temp_settings = [('window.hide_wayland_decoration',
+                               str(configval))]
+        configinit.early_init(args)
+
+        expected = '1' if configval else None
+        assert os.environ.get(envvar) == expected
+
 
 @pytest.mark.parametrize('errors', [True, False])
 def test_late_init(init_patch, monkeypatch, fake_save_manager, args,