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user32: Don't regard the clipboard as changed if we don't own it. 

I ran into a situation where user32 will call EndClipboardUpdate even though
the clipboard hasn't changed. It went something like this:
* Program A acquires the clipboard and adds some delay-rendered data.
* Program B requests data from the clipboard, causing program A to receive
  WM_RENDERFORMAT.
* Program A calls SetClipboardData to fulfill the request, setting
  bCBHasChanged to TRUE.
* Program C acquires the clipboard.
* Program A opens the clipboard to enumerate the formats. When it closes the
  clipboard, EndClipboardUpdate is called.

Signed-off-by: Vincent Povirk <vincent@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Vincent Povirk 2016-05-18 14:23:47 -05:00 committed by Alexandre Julliard
parent 1383012395
commit b68e03f9c9
1 changed files with 14 additions and 3 deletions
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17
dlls/user32/clipboard.c
View File

@ -178,6 +178,7 @@ INT WINAPI GetClipboardFormatNameA(UINT wFormat, LPSTR retStr, INT maxlen)
BOOL WINAPI OpenClipboard( HWND hWnd )
{
BOOL bRet;
UINT flags;
TRACE("(%p)...\n", hWnd);
@ -185,10 +186,16 @@ BOOL WINAPI OpenClipboard( HWND hWnd )
{
req->flags = SET_CB_OPEN;
req->clipboard = wine_server_user_handle( hWnd );
bRet = !wine_server_call( req );
if ((bRet = !wine_server_call( req )))
flags = reply->flags;
}
SERVER_END_REQ;
if (bRet && !(flags & CB_PROCESS))
{
bCBHasChanged = FALSE;
}
TRACE(" returning %i\n", bRet);
return bRet;
@ -201,6 +208,7 @@ BOOL WINAPI OpenClipboard( HWND hWnd )
BOOL WINAPI CloseClipboard(void)
{
HWND viewer = 0;
UINT flags;
BOOL ret;
TRACE("() Changed=%d\n", bCBHasChanged);
@ -210,18 +218,21 @@ BOOL WINAPI CloseClipboard(void)
req->flags = SET_CB_CLOSE;
if (bCBHasChanged) req->flags |= SET_CB_SEQNO;
if ((ret = !wine_server_call_err( req )))
{
viewer = wine_server_ptr_handle( reply->old_viewer );
flags = reply->flags;
}
}
SERVER_END_REQ;
if (!ret) return FALSE;
if (bCBHasChanged)
if (bCBHasChanged && (flags & CB_PROCESS))
{
USER_Driver->pEndClipboardUpdate();
bCBHasChanged = FALSE;
if (viewer) SendNotifyMessageW(viewer, WM_DRAWCLIPBOARD, (WPARAM) GetClipboardOwner(), 0);
}
bCBHasChanged = FALSE;
return TRUE;
}