https://bugs.kde.org/show_bug.cgi?id=431133
Bug ID: 431133
Summary: XKeyboardUngrab generated FocusOut event improperly
handled
Product: kwin
Version: 5.20.4
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-x11-standalone
Assignee: kwin-bugs-n...@kde.org
Reporter: ge...@hostfission.com
Target Milestone: ---
When an application calls XKeyboardUngrab as per the X11 specifications, a
`FocusOut` event is generated with the mode set to `NotifyUngrab`. kwin
incorrectly processes this event and unhighlights the application caption bar
as well as the icon on the task bar.
STEPS TO REPRODUCE
1. Compile the following application using:
gcc reproduce.c -L/usr/X11R6/lib -lX11 -o reproduce
#include <X11/Xlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
int main(void) {
Display *d;
Window w;
XEvent e;
const char *msg = "Hello, World!";
int s;
bool toggle = false;
d = XOpenDisplay(NULL);
if (d == NULL) {
fprintf(stderr, "Cannot open display\n");
exit(1);
}
s = DefaultScreen(d);
w = XCreateSimpleWindow(d, RootWindow(d, s), 10, 10, 100, 100, 1,
BlackPixel(d, s), WhitePixel(d, s));
XSelectInput(d, w, ExposureMask | KeyPressMask);
XMapWindow(d, w);
while (1) {
XNextEvent(d, &e);
if (e.type == Expose) {
XFillRectangle(d, w, DefaultGC(d, s), 20, 20, 10, 10);
XDrawString(d, w, DefaultGC(d, s), 10, 50, msg, strlen(msg));
}
if (e.type == KeyPress)
{
toggle = !toggle;
if (toggle)
XGrabKeyboard(
d,
w,
true,
GrabModeAsync,
GrabModeAsync,
CurrentTime);
else
XUngrabKeyboard(d, CurrentTime);
}
}
XCloseDisplay(d);
return 0;
}
2. Run the resulting application
3. Press any key on the keyboard to toggle the keyboard grab/ungrab
OBSERVED RESULT
The application shows that it has lost focus and the taskbar panel, and in the
case of a full-screen application the taskbar will overlap the application.
EXPECTED RESULT
The application to show it still has focus and the taskbar panel to remain
behind the application.
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