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Fix selection dialog display on MS-Windows

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* src/w32fns.c (w32_wnd_proc) <WM_PAINT>: Update the frame from
the back buffer when double-buffering is in effect and a selection
dialog is open.
(w32_dialog_in_progress): Indicate to 'w32_wnd_proc' that a
selection dialog is open.  (Bug#55208)
This commit is contained in:
Eli Zaretskii 2022-05-08 09:24:29 +03:00
parent 48c422e255
commit a85e30516e
1 changed files with 21 additions and 0 deletions
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21
src/w32fns.c
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@ -247,6 +247,8 @@ static HWND w32_visible_system_caret_hwnd;
static int w32_unicode_gui;
static bool w32_selection_dialog_open;
/* From w32menu.c */
int menubar_in_use = 0;
@ -4184,6 +4186,16 @@ w32_wnd_proc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
update_rect.left, update_rect.top,
update_rect.right, update_rect.bottom));
#endif
/* Under double-buffering, update the frame from the back
buffer, to prevent a "ghost" of the selection dialog to
be left on display while the user selects in the dialog. */
if (w32_selection_dialog_open
&& !w32_disable_double_buffering
&& FRAME_OUTPUT_DATA (f)->paint_dc)
BitBlt (FRAME_OUTPUT_DATA (f)->paint_buffer_handle,
0, 0, FRAME_PIXEL_WIDTH (f), FRAME_PIXEL_HEIGHT (f),
FRAME_OUTPUT_DATA (f)->paint_dc, 0, 0, SRCCOPY);
EndPaint (hwnd, &paintStruct);
leave_crit ();
@ -7755,6 +7767,15 @@ w32_dialog_in_progress (Lisp_Object in_progress)
{
Lisp_Object frames, frame;
/* Indicate to w32_wnd_proc that the selection dialog is about to be
open (or was closed, if IN_PROGRESS is nil). */
if (!w32_disable_double_buffering)
{
enter_crit ();
w32_selection_dialog_open = !NILP (in_progress);
leave_crit ();
}
/* Don't let frames in `above' z-group obscure dialog windows. */
FOR_EACH_FRAME (frames, frame)
{