Remove code to keep lsptooltips on screen on wayland

On wayland this is uneeded as the popups are always kept on screen using
a semantic positioning system.

It's also wrong as the client considers itself at 0,0, even if it's not.
So any attempts to help only make things worse.

addons/lspclient/lsptooltip.cpp

@@ -25,6 +25,8 @@
 #include <KSyntaxHighlighting/Repository>
 #include <KSyntaxHighlighting/SyntaxHighlighter>
 
+#include <KWindowSystem>
+
 class Tooltip : public QTextBrowser
 {
     Q_OBJECT
@@ -171,6 +173,15 @@ public:
 
     void place(QPoint p)
     {
+        const auto offset = QPoint(3, 21);
+        p += offset;
+
+        // wayland automatically keeps popups on screen
+        if (KWindowSystem::isPlatformWayland()) {
+            move(p);
+            return;
+        }
+
         // try to get right screen, important: QApplication::screenAt(p) might return nullptr
         // see crash in bug 439804
         const QScreen *screenForTooltip = QApplication::screenAt(p);
@@ -179,9 +190,6 @@ public:
         }
         const QRect screen = screenForTooltip->availableGeometry();
 
-        const auto offset = QPoint(3, 21);
-        p += offset;
-
         if (p.x() + width() > screen.x() + screen.width())
             p.rx() -= 4 + width();
         if (p.y() + this->height() > screen.y() + screen.height())