[PATCH 14/17] shell32/autocomplete: Reset the contents of the AutoComplete listbox when hiding it

[Gabriel Ivăncescu]

Signed-off-by: Gabriel Ivăncescu 
---
 dlls/shell32/autocomplete.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/dlls/shell32/autocomplete.c b/dlls/shell32/autocomplete.c
index 9bc617b..c5bc582 100644
--- a/dlls/shell32/autocomplete.c
+++ b/dlls/shell32/autocomplete.c
@@ -109,6 +109,14 @@ static void set_text_and_selection(IAutoCompleteImpl *This, HWND hwnd, WCHAR *te
         CallWindowProcW(proc, hwnd, EM_SETSEL, start, end);
 }

+static void hide_listbox(IAutoCompleteImpl *ac, HWND hwnd)
+{
+    /* hide the AutoComplete listbox but also reset its contents to avoid
+       memory use buildup for tons of edit controls with AutoComplete */
+    ShowWindow(hwnd, SW_HIDE);
+    send_to_LB(ac, hwnd, LB_RESETCONTENT, 0, 0);
+}
+
 static void destroy_autocomplete_object(IAutoCompleteImpl *ac)
 {
     ac->hwndEdit = NULL;
@@ -137,12 +145,12 @@ static LRESULT APIENTRY ACEditSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam,
     {
         case CB_SHOWDROPDOWN:
             if (This->options & ACO_AUTOSUGGEST)
-                ShowWindow(This->hwndListBox, SW_HIDE);
+                hide_listbox(This, This->hwndListBox);
             break;
         case WM_KILLFOCUS:
             if ((This->options & ACO_AUTOSUGGEST) && ((HWND)wParam != This->hwndListBox))
             {
-                ShowWindow(This->hwndListBox, SW_HIDE);
+                hide_listbox(This, This->hwndListBox);
             }
             return CallWindowProcW(This->wpOrigEditProc, hwnd, uMsg, wParam, lParam);
         case WM_KEYDOWN:
@@ -181,7 +189,7 @@ static LRESULT APIENTRY ACEditSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam,

This->no_fwd_char = '\n';  /* CTRL+RETURN char */
                         if (This->options & ACO_AUTOSUGGEST)
-                            ShowWindow(This->hwndListBox, SW_HIDE);
+                            hide_listbox(This, This->hwndListBox);
                         heap_free(hwndText);
                         return 0;
                     }
@@ -196,13 +204,13 @@ static LRESULT APIENTRY ACEditSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam,
                                     len = send_to_LB(This, hwndListBox, LB_GETTEXT, sel, (LPARAM)hwndText);
                                     set_text_and_selection(This, hwnd, hwndText, 0, len);
                                     This->no_fwd_char = '\r';          /* RETURN char */
-                                    ShowWindow(hwndListBox, SW_HIDE);
+                                    hide_listbox(This, hwndListBox);
                                     heap_free(hwndText);
                                     return 0;
                                 }
                             }
                         }
-                        ShowWindow(This->hwndListBox, SW_HIDE);
+                        hide_listbox(This, This->hwndListBox);
                     }
                     break;
                 case VK_UP:
@@ -267,7 +275,7 @@ static LRESULT APIENTRY ACEditSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam,
                 edit_proc = edit_proc == ACEditSubclassProc ? This->wpOrigEditProc : edit_proc;
                 len = CallWindowProcW(edit_proc, hwnd, WM_GETTEXTLENGTH, 0, 0);
                 if ((This->options & ACO_AUTOSUGGEST) && len == 0) {
-                    ShowWindow(This->hwndListBox, SW_HIDE);
+                    hide_listbox(This, This->hwndListBox);
                     return ret;
                 }
                 if (wParam != 0x16 /* ^V (paste) */)
@@ -360,7 +368,7 @@ static LRESULT APIENTRY ACEditSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam,
                                  SWP_SHOWWINDOW );
                     send_to_LB(This, This->hwndListBox, WM_SETREDRAW, TRUE, 0);
                 } else {
-                    ShowWindow(This->hwndListBox, SW_HIDE);
+                    hide_listbox(This, This->hwndListBox);
                 }
             }
             return ret;
@@ -400,7 +408,7 @@ static LRESULT APIENTRY ACLBoxSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam,
             if ((msg = heap_alloc((len + 1)*sizeof(WCHAR)))) {
                 len = send_to_LB(This, hwnd, LB_GETTEXT, sel, (LPARAM)msg);
                 set_text_and_selection(This, This->hwndEdit, msg, 0, len);
-                ShowWindow(hwnd, SW_HIDE);
+                hide_listbox(This, hwnd);
                 heap_free(msg);
             }
             break;