fix(chat_section): reset activeItem when the last channel is removed

Fixes #6536

src/app/modules/main/chat_section/active_item.nim

@@ -24,6 +24,7 @@ QtObject:
   #################################################
   # Forward declaration section
   proc activeSubItemChanged(self: ActiveItem) {.signal.}
+  proc idChanged(self: ActiveItem) {.signal.}
 
   #################################################
 
@@ -32,6 +33,13 @@ QtObject:
     self.activeSubItem.setActiveSubItemData(subItem)
     self.activeSubItemChanged()
 
+  # Used when there is no longer an active item (last channel was deleted)
+  proc resetActiveItemData*(self: ActiveItem) =
+    self.item = Item()
+    self.activeSubItem.setActiveSubItemData(SubItem())
+    self.idChanged()
+    self.activeSubItemChanged()
+
   proc getId(self: ActiveItem): string {.slot.} =
     if(self.item.isNil):
       return ""
@@ -39,6 +47,7 @@ QtObject:
 
   QtProperty[string] id:
     read = getId
+    notify = idChanged
 
   proc getIsSubItemActive(self: ActiveItem): bool {.slot.} =
     if(self.activeSubItem.getId().len > 0):

src/app/modules/main/chat_section/controller.nim

@@ -252,7 +252,9 @@ proc setActiveItemSubItem*(self: Controller, itemId: string, subItemId: string)
   self.activeItemId = itemId
   self.activeSubItemId = subItemId
 
-  self.messageService.asyncLoadInitialMessagesForChat(self.getActiveChatId())
+  let chatId = self.getActiveChatId()
+  if chatId != "":
+    self.messageService.asyncLoadInitialMessagesForChat(chatId)
 
   # We need to take other actions here like notify status go that unviewed mentions count is updated and so...
 

src/app/modules/main/chat_section/module.nim

@@ -2,7 +2,7 @@ import NimQml, Tables, chronicles, json, sequtils, strutils, strformat, sugar
 
 import io_interface
 import ../io_interface as delegate_interface
-import view, controller, item, sub_item, sub_model, base_item
+import view, controller, item, sub_item, sub_model, base_item, active_item
 import model as chats_model
 import ../../shared_models/user_item as user_item
 import ../../shared_models/user_model as user_model
@@ -310,6 +310,10 @@ method makeChatWithIdActive*(self: Module, chatId: string) =
   self.setActiveItemSubItem(item.BaseItem.id, subItemId)
 
 method activeItemSubItemSet*(self: Module, itemId: string, subItemId: string) =
+  if (itemId == "" and subItemId == ""):
+    self.view.activeItem().resetActiveItemData()
+    return
+
   let item = self.view.chatsModel().getItemById(itemId)
   if(item.isNil):
     # Should never be here
@@ -492,6 +496,7 @@ method onCommunityCategoryDeleted*(self: Module, cat: Category) =
 
 method setFirstChannelAsActive*(self: Module) =
   if(self.view.chatsModel().getCount() == 0):
+    self.setActiveItemSubItem("", "")
     return
   let item = self.view.chatsModel().getItemAtIndex(0)
   if(item.subItems.getCount() == 0):

src/app/modules/main/chat_section/view.nim

@@ -120,6 +120,9 @@ QtObject:
   proc setActiveItem*(self: View, itemId: string, subItemId: string = "") {.slot.} =
     self.delegate.setActiveItemSubItem(itemId, subItemId)
 
+  proc activeItem*(self: View): ActiveItem =
+    result = self.activeItem
+
   # Since we cannot return QVariant from the proc which has arguments, so cannot have proc like this:
   # prepareChatContentModuleForChatId(self: View, chatId: string): QVariant {.slot.}
   # we're using combinaiton of