Add tab stops in Function List

Add tab stops in Function List to switch between search field and list.

Fix 8665, close #8924

PowerEditor/src/WinControls/FunctionList/functionListPanel.cpp

@@ -575,6 +575,10 @@ void FunctionListPanel::notified(LPNMHDR notification)
 					}
 					PostMessage(_hParent, WM_COMMAND, SCEN_SETFOCUS << 16, reinterpret_cast<LPARAM>((*_ppEditView)->getHSelf()));
 				}
+				else if (ptvkd->wVKey == VK_TAB)
+				{
+					::SetFocus(_hSearchEdit);
+				}
 				else if (ptvkd->wVKey == VK_ESCAPE)
 				{
 					PostMessage(_hParent, WM_COMMAND, SCEN_SETFOCUS << 16, reinterpret_cast<LPARAM>((*_ppEditView)->getHSelf()));
@@ -696,6 +700,11 @@ static LRESULT CALLBACK funclstSearchEditProc(HWND hwnd, UINT message, WPARAM wP
 				::SendMessage(hwnd, WM_SETTEXT, 0, reinterpret_cast<LPARAM>(TEXT("")));
 				return FALSE;
 			}
+			else if (wParam == VK_TAB)
+			{
+				::SendMessage(GetParent(hwnd), WM_COMMAND, VK_TAB, 1);
+				return FALSE;
+			}
 		}
 	}
 	return oldFunclstSearchEditProc(hwnd, message, wParam, lParam);
@@ -842,6 +851,14 @@ INT_PTR CALLBACK FunctionListPanel::run_dlgProc(UINT message, WPARAM wParam, LPA
 					}
 				}
 			}
+			else if (wParam == VK_TAB)
+			{
+				if (_treeViewSearchResult.isVisible())
+					::SetFocus(_treeViewSearchResult.getHSelf());
+				else
+					::SetFocus(_treeView.getHSelf());
+				return TRUE;
+			}
 
 			switch (LOWORD(wParam))
             {