Use more meaningful option name

Author: piroor

webextensions/common/common.js

@@ -355,7 +355,7 @@ export const configs = new Configs({
   successorTabControlLevel: Constants.kSUCCESSOR_TAB_CONTROL_IN_TREE,
   simulateSelectOwnerOnClose: true,
   simulateLockTabSizing: true,
-  lockScrollPositionToSelectOwnerOnClose: true,
+  deferScrollingToOutOfViewportSuccessor: true,
   simulateTabsLoadInBackgroundInverted: false,
   supportTabsMultiselect: typeof browser.menus.overrideContext == 'function',
   warnOnCloseTabs: true,

webextensions/sidebar/scroll.js

@@ -1398,7 +1398,7 @@ CollapseExpand.onUpdated.addListener((tab, options) => {
 // https://searchfox.org/mozilla-central/rev/27932d4e6ebd2f4b8519865dad864c72176e4e3b/browser/base/content/tabbrowser-tabs.js#1207
 export async function tryLockPosition(tabIds, reason) {
   if ((!configs.simulateLockTabSizing &&
-       !configs.lockScrollPositionToSelectOwnerOnClose) ||
+       !configs.deferScrollingToOutOfViewportSuccessor) ||
       tabIds.every(id => {
         const tab = Tab.get(id);
         return !tab || tab.pinned || tab.hidden;
@@ -1407,7 +1407,7 @@ export async function tryLockPosition(tabIds, reason) {
     return;
   }
 
-  if (configs.lockScrollPositionToSelectOwnerOnClose)
+  if (configs.deferScrollingToOutOfViewportSuccessor)
     await tryLockScrollToSuccessor(tabIds, reason);
 
   if (configs.simulateLockTabSizing)
@@ -1506,7 +1506,7 @@ function unlockScrollToSuccessor(canContinueToScroll) {
 
 export function tryUnlockPosition(tabIds) {
   if ((!configs.simulateLockTabSizing &&
-       !configs.lockScrollPositionToSelectOwnerOnClose) ||
+       !configs.deferScrollingToOutOfViewportSuccessor) ||
       tabIds.every(id => {
         const tab = Tab.get(id);
         return !tab || tab.pinned || tab.hidden;