unified layout-setting code and made an option to control or disable

third column behavior

src/modules/config.js

@@ -46,6 +46,7 @@ export const defaultState = {
   pauseOnUnfocused: true,
   stopGifs: true,
   replyVisibility: 'all',
+  thirdColumnMode: 'notifications',
   notificationVisibility: {
     follows: true,
     mentions: true,
@@ -165,6 +166,9 @@ const config = {
         case 'interfaceLanguage':
           messages.setLanguage(this.getters.i18n, value)
           break
+        case 'thirdColumnMode':
+          dispatch('setLayoutWidth', undefined)
+          break
       }
     }
   }

src/modules/interface.js

@@ -72,6 +72,9 @@ const interfaceMod = {
     setLayoutHeight (state, value) {
       state.layoutHeight = value
     },
+    setLayoutWidth (state, value) {
+      state.layoutWidth = value
+    },
     setLastTimeline (state, value) {
       state.lastTimeline = value
     }
@@ -86,9 +89,6 @@ const interfaceMod = {
     setNotificationPermission ({ commit }, permission) {
       commit('setNotificationPermission', permission)
     },
-    setLayoutType ({ commit }, value) {
-      commit('setLayoutType', value)
-    },
     closeSettingsModal ({ commit }) {
       commit('closeSettingsModal')
     },
@@ -133,6 +133,24 @@ const interfaceMod = {
     setLayoutHeight ({ commit }, value) {
       commit('setLayoutHeight', value)
     },
+    // value is optional, assuming it was cached prior
+    setLayoutWidth ({ commit, state, rootGetters }, value) {
+      let width = value
+      if (value !== undefined) {
+        commit('setLayoutWidth', value)
+      } else {
+        width = state.layoutWidth
+      }
+      const mobileLayout = width <= 800
+      const normalOrMobile = mobileLayout ? 'mobile' : 'normal'
+      const { thirdColumnMode } = rootGetters.mergedConfig
+      if (thirdColumnMode === 'none') {
+        commit('setLayoutType', normalOrMobile)
+      } else {
+        const wideLayout = width >= 1300
+        commit('setLayoutType', wideLayout ? 'wide' : normalOrMobile)
+      }
+    },
     setLastTimeline ({ commit }, value) {
       commit('setLastTimeline', value)
     }