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Avoid background fills on parent during child frame resize/move/hide

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* src/xterm.c (x_suspend_background_fills)
(x_restore_background_fills): New functions.
(x_set_window_size, x_set_window_size_and_position)
(x_make_frame_invisible): Use them (bug#80961).
This commit is contained in:
Dmitry Gutov 2026-05-11 05:51:49 +03:00
parent 08336b9a55
commit c9dfe2abe6
1 changed files with 39 additions and 0 deletions
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39
src/xterm.c
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@ -28542,6 +28542,27 @@ x_set_window_size_1 (struct frame *f, bool change_gravity,
}
}
/* Resizing an occluding window (such as a child frame) immediately
triggers a fill with background color on the exposed area on the
parent when the X server receives the corresponding command
(XResizeWindow, XMoveResizeWindow, etc). But only if the window has
a background assigned. Change it to None to block that effect. */
static void
x_suspend_background_fills (struct frame *f)
{
Display *dpy = FRAME_X_DISPLAY (f);
XSetWindowBackgroundPixmap (dpy, FRAME_X_WINDOW (f), None);
}
/* No automatmic fill happens when the background is restored. */
static void
x_restore_background_fills (struct frame *f)
{
Display *dpy = FRAME_X_DISPLAY (f);
XSetWindowBackground (dpy, FRAME_X_WINDOW (f), FRAME_BACKGROUND_PIXEL (f));
}
/* Change the size of frame F's X window to WIDTH and HEIGHT pixels. If
CHANGE_GRAVITY, change to top-left-corner window gravity for this
@ -28554,6 +28575,9 @@ x_set_window_size (struct frame *f, bool change_gravity,
{
block_input ();
if (FRAME_PARENT_FRAME (f))
x_suspend_background_fills (FRAME_PARENT_FRAME (f));
#ifdef USE_GTK
if (FRAME_GTK_WIDGET (f))
xg_frame_set_char_size (f, width, height);
@ -28565,6 +28589,9 @@ x_set_window_size (struct frame *f, bool change_gravity,
x_clear_under_internal_border (f);
#endif /* not USE_GTK */
if (FRAME_PARENT_FRAME (f))
x_restore_background_fills (FRAME_PARENT_FRAME (f));
/* If cursor was outside the new size, mark it as off. */
mark_window_cursors_off (XWINDOW (f->root_window));
@ -28626,6 +28653,9 @@ x_set_window_size_and_position (struct frame *f, int width, int height)
{
block_input ();
if (FRAME_PARENT_FRAME (f))
x_suspend_background_fills (FRAME_PARENT_FRAME (f));
#ifdef USE_GTK
if (FRAME_GTK_WIDGET (f))
xg_frame_set_size_and_position (f, width, height);
@ -28638,6 +28668,9 @@ x_set_window_size_and_position (struct frame *f, int width, int height)
if (!FRAME_PARENT_FRAME (f))
x_clear_under_internal_border (f);
if (FRAME_PARENT_FRAME (f))
x_restore_background_fills (FRAME_PARENT_FRAME (f));
/* If cursor was outside the new size, mark it as off. */
mark_window_cursors_off (XWINDOW (FRAME_ROOT_WINDOW (f)));
@ -29397,6 +29430,9 @@ x_make_frame_invisible (struct frame *f)
by hand again (they have already done that once for this window.) */
x_wm_set_size_hint (f, 0, true);
if (FRAME_PARENT_FRAME (f))
x_suspend_background_fills (FRAME_PARENT_FRAME (f));
#ifdef USE_GTK
if (FRAME_GTK_OUTER_WIDGET (f))
gtk_widget_hide (FRAME_GTK_OUTER_WIDGET (f));
@ -29414,6 +29450,9 @@ x_make_frame_invisible (struct frame *f)
error ("Can't notify window manager of window withdrawal");
}
if (FRAME_PARENT_FRAME (f))
x_restore_background_fills (FRAME_PARENT_FRAME (f));
/* Don't perform the synchronization if the network connection is
slow, and the user says it is unwanted. */
if (NILP (Vx_lax_frame_positioning))