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Implement IAutoComplete to realize input auto completion. CORE-9281, CORE-1419 - The main features of this PR are Auto-Suggest and Auto-Append. - Auto-Suggest shows a list near the textbox (an EDIT control) when the user has typed partial pathname into the textbox. - Auto-Append appends complement text into the textbox to complete the pathname with selected status. - The list of AutoSuggest is a top-level window whose window class is "Auto-Suggest Dropdown". We call it "the drop-down window". - The drop-down window contains three controls: a listview, a scrollbar and a sizebox. - The drop-down window watches the input into the textbox. If the textbox changed, then the window updates the list. - The sizebox control enables the user to resize the drop-down window.