Fixed a bug with the non-functional Shift+Cmd+R hotkey. Added the Tab…

…s section to the Help.md (#422)

Docs/Help.md

@@ -259,7 +259,28 @@ This screenshot shows a `Volumes` Quick List:
 ![Quick List](Help-panel-quicklist.png)
 
 ### Tabs
-_to be written_
+
+File panels support a tabbed interface, allowing multiple locations to be opened simultaneously on either the left or right pane. The tab bar appears automatically if more than one tab is open in a pane, but it can also be forced to always show via the menu `View > Show Tab Bar` or by using the hotkey `Cmd + Shift + T`. The screenshot below shows Nimble Commander's window with two tabs in the left pane and three tabs in the right pane:
+
+![Tabbed Interface](Help-panel-tabs.png)
+
+A new tab can be opened in several ways:
+
+- Menu `File > New Tab` or the `Cmd + T` hotkey creates a new tab with the same location.
+- Pressing the "+" button next to the tab bar. A long click or right click will display a list of recently closed locations.
+- Hitting the `Shift + Cmd + R` hotkey restores the last closed tab and activates it.
+- `Alt + Cmd + Return` reveals the currently focused item in a new tab on the opposite pane.
+
+To switch the active tab, the following hotkeys can be used:
+
+- `Shift + Cmd + ]` or `Ctrl + Tab` to switch to the next tab.
+- `Shift + Cmd + [` or `Ctrl + Shift + Tab` to switch to the previous tab.
+- The `File Panels > Show Tab №1..№10` hotkeys can be assigned to activate a specific tab.
+
+To close tabs, you can use the following hotkeys:
+
+- `Cmd + W` - closes the current tab.
+- `Alt + Cmd + W` - closes all other tabs.
 
 ### Favorites
 _to be written_

Source/NimbleCommander/NimbleCommander/States/FilePanels/MainWindowFilePanelState+TabsSupport.mm

@@ -211,19 +211,25 @@ - (void)showAddTabMenuForTabView:(NSTabView *)aTabView
 
 - (void)respawnRecentlyClosedCallout:(id)sender
 {
-    if( auto menu_item = nc::objc_cast<NCCommandPopoverItem>(sender) ) {
-        auto any_holder = nc::objc_cast<AnyHolder>(menu_item.representedObject);
-        if( !any_holder )
-            return;
+    AnyHolder *payload = nil;
 
-        if( auto request = std::any_cast<RestoreClosedTabRequest>(&any_holder.any) ) {
-            const auto tab_view = request->side == RestoreClosedTabRequest::Side::Left
-                                      ? m_SplitView.leftTabbedHolder.tabView
-                                      : m_SplitView.rightTabbedHolder.tabView;
-            [self spawnNewTabInTabView:tab_view loadingListingPromise:request->promise activateNewPanel:true];
-            if( m_ClosedPanelsHistory )
-                m_ClosedPanelsHistory->RemoveListing(request->promise);
-        }
+    if( auto popover_item = nc::objc_cast<NCCommandPopoverItem>(sender) ) {
+        payload = nc::objc_cast<AnyHolder>(popover_item.representedObject);
+    }
+    else if( auto menu_item = nc::objc_cast<NSMenuItem>(sender) ) {
+        payload = nc::objc_cast<AnyHolder>(menu_item.representedObject);
+    }
+
+    if( !payload )
+        return;
+
+    if( auto request = std::any_cast<RestoreClosedTabRequest>(&payload.any) ) {
+        const auto tab_view = request->side == RestoreClosedTabRequest::Side::Left
+                                  ? m_SplitView.leftTabbedHolder.tabView
+                                  : m_SplitView.rightTabbedHolder.tabView;
+        [self spawnNewTabInTabView:tab_view loadingListingPromise:request->promise activateNewPanel:true];
+        if( m_ClosedPanelsHistory )
+            m_ClosedPanelsHistory->RemoveListing(request->promise);
     }
 }