Never delete the font object received by WM_SETFONT.

dlls/comctl32/comboex.c

@@ -120,6 +120,7 @@ typedef struct
     DWORD        dwExtStyle;
     INT          selected;         /* index of selected item */
     DWORD        flags;            /* WINE internal flags */
+    HFONT        hDefaultFont;
     HFONT        font;
     INT          nb_items;         /* Number of items */
     BOOL         bUnicode;        /* TRUE if this window is Unicode   */
@@ -1209,7 +1210,7 @@ COMBOEX_Create (HWND hwnd, WPARAM wParam, LPARAM lParam)
     if (!infoPtr->font) {
 	SystemParametersInfoA (SPI_GETICONTITLELOGFONT, sizeof(mylogfont), 
 			       &mylogfont, 0);
-	infoPtr->font = CreateFontIndirectA (&mylogfont);
+	infoPtr->font = infoPtr->hDefaultFont = CreateFontIndirectA (&mylogfont);
     }
     SendMessageW (infoPtr->hwndCombo, WM_SETFONT, (WPARAM)infoPtr->font, 0);
     if (infoPtr->hwndEdit) {
@@ -1750,7 +1751,7 @@ COMBOEX_Destroy (HWND hwnd, WPARAM wParam, LPARAM lParam)
 	}
     }
 
-    DeleteObject (infoPtr->font);
+    if (infoPtr->hDefaultFont) DeleteObject (infoPtr->hDefaultFont);
 
     /* free comboex info data */
     COMCTL32_Free (infoPtr);

dlls/comctl32/rebar.c

@@ -200,6 +200,7 @@ typedef struct
     HWND     hwndSelf;    /* handle of REBAR window itself */
     HWND     hwndToolTip; /* handle to the tool tip control */
     HWND     hwndNotify;  /* notification window (parent) */
+    HFONT    hDefaultFont;
     HFONT    hFont;       /* handle to the rebar's font */
     SIZE     imageSize;   /* image size (image list) */
     DWORD    dwStyle;     /* window style */
@@ -3624,7 +3625,7 @@ REBAR_Destroy (REBAR_INFO *infoPtr, WPARAM wParam, LPARAM lParam)
     DeleteObject (infoPtr->hcurHorz);
     DeleteObject (infoPtr->hcurVert);
     DeleteObject (infoPtr->hcurDrag);
-    DeleteObject (infoPtr->hFont);
+    if(infoPtr->hDefaultFont) DeleteObject (infoPtr->hDefaultFont);
     SetWindowLongA (infoPtr->hwndSelf, 0, 0);
 
     /* free rebar info data */
@@ -3834,7 +3835,7 @@ REBAR_NCCreate (HWND hwnd, WPARAM wParam, LPARAM lParam)
     }
     tfont = CreateFontIndirectA (&ncm.lfCaptionFont);
     if (tfont) {
-	infoPtr->hFont = tfont;
+        infoPtr->hFont = infoPtr->hDefaultFont = tfont;
     }
 
 /* native does:

dlls/comctl32/toolbar.c

@@ -95,6 +95,7 @@ typedef struct
     INT      nButtonDown;
     INT      nOldHit;
     INT      nHotItem;        /* index of the "hot" item */
+    HFONT    hDefaultFont;
     HFONT    hFont;           /* text font */
     HIMAGELIST himlInt;         /* image list created internally */
     HIMAGELIST himlDef;         /* default image list */
@@ -4048,7 +4049,7 @@ TOOLBAR_Create (HWND hwnd, WPARAM wParam, LPARAM lParam)
     infoPtr->hwndSelf = hwnd;
 
     SystemParametersInfoA (SPI_GETICONTITLELOGFONT, 0, &logFont, 0);
-    infoPtr->hFont = CreateFontIndirectA (&logFont);
+    infoPtr->hFont = infoPtr->hDefaultFont = CreateFontIndirectA (&logFont);
 
     if (dwStyle & TBSTYLE_TOOLTIPS) {
 	/* Create tooltip control */
@@ -4106,7 +4107,7 @@ TOOLBAR_Destroy (HWND hwnd, WPARAM wParam, LPARAM lParam)
 
     /* delete default font */
     if (infoPtr->hFont)
-	DeleteObject (infoPtr->hFont);
+	DeleteObject (infoPtr->hDefaultFont);
 
     /* free toolbar info data */
     COMCTL32_Free (infoPtr);