Fixing tabmove not working properly when there's a split in pane (zyedidia#3371)

Author: Neko-Box-Coder

internal/action/command.go

@@ -198,7 +198,7 @@ func (h *BufPane) TabMoveCmd(args []string) {
 	idxTo = util.Clamp(idxTo, 0, len(Tabs.List)-1)
 
 	activeTab := Tabs.List[idxFrom]
-	Tabs.RemoveTab(activeTab.ID())
+	Tabs.RemoveTab(activeTab.Panes[0].ID())
 	Tabs.List = append(Tabs.List, nil)
 	copy(Tabs.List[idxTo+1:], Tabs.List[idxTo:])
 	Tabs.List[idxTo] = activeTab