Add tabs.max_width setting

qutebrowser/config/configdata.yml

@@ -1602,6 +1602,23 @@ tabs.min_width:
 
     This setting does not apply to pinned tabs, unless `tabs.pinned.shrink` is False.
 
+tabs.max_width:
+  default: -1
+  type:
+    name: Int
+    minval: -1
+    maxval: maxint
+  desc: >-
+    Maximum width (in pixels) of tabs (-1 for no maximum).
+
+    This setting only applies when tabs are horizontal.
+
+    This setting does not apply to pinned tabs, unless `tabs.pinned.shrink` is
+    False.
+
+    This setting may not apply properly if max_width is smaller than the
+    minimum size of tab contents, or smaller than tabs.min_width.
+
 tabs.width.indicator:
   renamed: tabs.indicator.width
 

qutebrowser/mainwindow/tabwidget.py

@@ -610,6 +610,9 @@ class TabBar(QTabBar):
                 # Request as much space as possible so we fill the tabbar, let
                 # Qt shrink us down
                 width = self.width()
+                max_width = config.cache['tabs.max_width']
+                if max_width > 0:
+                    width = min(max_width, width)
 
             # If we don't have enough space, we return the minimum size
             width = max(width, minimum_size.width())

tests/unit/mainwindow/test_tabwidget.py

@@ -38,6 +38,7 @@ class TestTabWidget:
         qtbot.addWidget(w)
         monkeypatch.setattr(tabwidget.objects, 'backend',
                             usertypes.Backend.QtWebKit)
+        monkeypatch.setattr(w.tabBar(), 'width', w.width)
         return w
 
     @pytest.fixture
@@ -108,7 +109,7 @@ class TestTabWidget:
 
         for i in range(num_tabs):
             if i in pinned_num and shrink_pinned and not vertical:
-                assert (first_size.width() <
+                assert (first_size.width() >
                         widget.tabBar().tabSizeHint(i).width())
                 assert (first_size_min.width() <
                         widget.tabBar().minimumTabSizeHint(i).width())
@@ -128,6 +129,22 @@ class TestTabWidget:
 
         benchmark(widget.update_tab_titles)
 
+    def test_tab_min_width(self, widget, fake_web_tab, config_stub):
+        """Ensure by default, all tab sizes are the same."""
+        widget.addTab(fake_web_tab(), 'foobar')
+        normal_size = widget.tabBar().minimumTabSizeHint(0).width()
+        normal_size += 100
+        config_stub.val.tabs.min_width = normal_size
+        assert widget.tabBar().minimumTabSizeHint(0).width() == normal_size
+
+    def test_tab_max_width(self, widget, fake_web_tab, config_stub):
+        """Ensure by default, all tab sizes are the same."""
+        widget.addTab(fake_web_tab(), 'foobar')
+        normal_size = widget.tabBar().tabSizeHint(0).width()
+        normal_size -= 10
+        config_stub.val.tabs.max_width = normal_size
+        assert widget.tabBar().tabSizeHint(0).width() == normal_size
+
     @pytest.mark.parametrize("num_tabs", [4, 10])
     def test_add_remove_tab_benchmark(self, benchmark, browser,
                                       qtbot, fake_web_tab, num_tabs):