https://bugs.kde.org/show_bug.cgi?id=454569
Bug ID: 454569
Summary: window snapping might snap to invisible windows during
resize
Product: kwin
Version: 5.24.5
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: core
Assignee: kwin-bugs-n...@kde.org
Reporter: bugs.kde....@derflupp.e4ward.com
Target Milestone: ---
When resizing a window with window snapping enabled, KWin considers, e.g.,
windows from other activities as snapping target although they are currently
invisible. This does not occur when a window is repositioned instead of
resized.
In the source code, AFAIS, the snapping implementations for repositioning and
resizing employ very different filters to determine potential snapping targets
(see `src/workspace.cpp`):
```C++
QPoint Workspace::adjustClientPosition(AbstractClient* c, QPoint pos, bool
unrestricted, double snapAdjust)
{
// […]
for (auto l = m_allClients.constBegin(); l !=
m_allClients.constEnd(); ++l) {
if ((*l) == c)
continue;
if ((*l)->isMinimized() || (*l)->isShade())
continue;
if (!(*l)->isShown())
continue;
if (!(*l)->isOnCurrentDesktop())
continue; // wrong virtual desktop
if (!(*l)->isOnCurrentActivity())
continue; // wrong activity
if ((*l)->isDesktop() || (*l)->isSplash() ||
(*l)->isNotification() ||
(*l)->isCriticalNotification() ||
(*l)->isOnScreenDisplay())
continue;
// [adapt position] […]
QRect Workspace::adjustClientSize(AbstractClient* c, QRect moveResizeGeom,
Gravity gravity)
{
// […]
for (auto l = m_allClients.constBegin(); l !=
m_allClients.constEnd(); ++l) {
if ((*l)->isOnCurrentDesktop() &&
!(*l)->isMinimized()
&& (*l) != c) {
// [adapt size] […]
```
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