Make Tab Layout setting only accept predefined values (#3564)

Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>

src/widgets/settingspages/GeneralPage.cpp

@@ -144,30 +144,34 @@ void GeneralPage::initLayout(GeneralPageView &layout)
         [](auto args) {
             return fuzzyToFloat(args.value, 1.f);
         });
-    layout.addDropdown<int>(
-        "Tab layout", {"Horizontal", "Vertical"}, s.tabDirection,
-        [](auto val) {
-            switch (val)
-            {
-                case NotebookTabDirection::Horizontal:
-                    return "Horizontal";
-                case NotebookTabDirection::Vertical:
-                    return "Vertical";
-            }
+    ComboBox *tabDirectionDropdown =
+        layout.addDropdown<std::underlying_type<NotebookTabDirection>::type>(
+            "Tab layout", {"Horizontal", "Vertical"}, s.tabDirection,
+            [](auto val) {
+                switch (val)
+                {
+                    case NotebookTabDirection::Horizontal:
+                        return "Horizontal";
+                    case NotebookTabDirection::Vertical:
+                        return "Vertical";
+                }
 
-            return "";
-        },
-        [](auto args) {
-            if (args.value == "Vertical")
-            {
-                return NotebookTabDirection::Vertical;
-            }
-            else
-            {
-                // default to horizontal
-                return NotebookTabDirection::Horizontal;
-            }
-        });
+                return "";
+            },
+            [](auto args) {
+                if (args.value == "Vertical")
+                {
+                    return NotebookTabDirection::Vertical;
+                }
+                else
+                {
+                    // default to horizontal
+                    return NotebookTabDirection::Horizontal;
+                }
+            },
+            false);
+    tabDirectionDropdown->setMinimumWidth(
+        tabDirectionDropdown->minimumSizeHint().width());
 
     layout.addCheckbox("Show tab close button", s.showTabCloseButton);
     layout.addCheckbox("Always on top", s.windowTopMost);