seat: fixup touch event handling

fixes #6353

src/managers/SeatManager.cpp

@@ -337,34 +337,11 @@ void CSeatManager::sendPointerAxis(uint32_t timeMs, wl_pointer_axis axis, double
 }
 
 void CSeatManager::sendTouchDown(SP<CWLSurfaceResource> surf, uint32_t timeMs, int32_t id, const Vector2D& local) {
-    if (state.touchFocus == surf)
-        return;
-
     listeners.touchSurfaceDestroy.reset();
 
-    if (state.touchFocusResource) {
-        auto client = state.touchFocusResource->client();
-        for (auto& s : seatResources) {
-            if (s->resource->client() != client)
-                continue;
-
-            for (auto& t : s->resource->touches) {
-                if (!t)
-                    continue;
-
-                t->sendUp(timeMs, id);
-            }
-        }
-    }
-
     state.touchFocusResource.reset();
     state.touchFocus = surf;
 
-    if (!surf) {
-        events.touchFocusChange.emit();
-        return;
-    }
-
     auto client = surf->client();
     for (auto& r : seatResources | std::views::reverse) {
         if (r->resource->client() != client)
@@ -381,11 +358,34 @@ void CSeatManager::sendTouchDown(SP<CWLSurfaceResource> surf, uint32_t timeMs, i
 
     listeners.touchSurfaceDestroy = surf->events.destroy.registerListener([this, timeMs, id](std::any d) { sendTouchUp(timeMs + 10, id); });
 
-    events.touchFocusChange.emit();
+    touchLocks++;
+
+    if (touchLocks <= 1)
+        events.touchFocusChange.emit();
 }
 
 void CSeatManager::sendTouchUp(uint32_t timeMs, int32_t id) {
-    sendTouchDown(nullptr, timeMs, id, {});
+    if (!state.touchFocusResource || touchLocks <= 0)
+        return;
+
+    auto client = state.touchFocusResource->client();
+    for (auto& r : seatResources | std::views::reverse) {
+        if (r->resource->client() != client)
+            continue;
+
+        state.touchFocusResource = r->resource;
+        for (auto& t : r->resource->touches) {
+            if (!t)
+                continue;
+
+            t->sendUp(timeMs, id);
+        }
+    }
+
+    touchLocks--;
+
+    if (touchLocks <= 0)
+        events.touchFocusChange.emit();
 }
 
 void CSeatManager::sendTouchMotion(uint32_t timeMs, int32_t id, const Vector2D& local) {

src/managers/SeatManager.hpp

@@ -155,6 +155,7 @@ class CSeatManager {
     } listeners;
 
     Vector2D lastLocalCoords;
+    int      touchLocks = 0; // we assume there aint like 20 touch devices at once...
 
     friend struct SSeatResourceContainer;
     friend class CSeatGrab;

src/protocols/core/Seat.cpp

@@ -25,37 +25,38 @@ void CWLTouchResource::sendDown(SP<CWLSurfaceResource> surface, uint32_t timeMs,
     if (!owner)
         return;
 
-    if (currentSurface) {
-        LOGM(WARN, "requested CWLTouchResource::sendDown without sendUp first.");
-        sendUp(timeMs, id);
-    }
-
     ASSERT(surface->client() == owner->client());
 
     currentSurface           = surface;
     listeners.destroySurface = surface->events.destroy.registerListener([this, timeMs, id](std::any d) { sendUp(timeMs + 10 /* hack */, id); });
 
     resource->sendDown(g_pSeatManager->nextSerial(owner.lock()), timeMs, surface->getResource().get(), id, wl_fixed_from_double(local.x), wl_fixed_from_double(local.y));
+
+    fingers++;
 }
 
 void CWLTouchResource::sendUp(uint32_t timeMs, int32_t id) {
-    if (!owner || !currentSurface)
+    if (!owner)
         return;
 
     resource->sendUp(g_pSeatManager->nextSerial(owner.lock()), timeMs, id);
-    currentSurface.reset();
-    listeners.destroySurface.reset();
+    fingers--;
+    if (fingers <= 0) {
+        currentSurface.reset();
+        listeners.destroySurface.reset();
+        fingers = 0;
+    }
 }
 
 void CWLTouchResource::sendMotion(uint32_t timeMs, int32_t id, const Vector2D& local) {
-    if (!owner || !currentSurface)
+    if (!owner)
         return;
 
     resource->sendMotion(timeMs, id, wl_fixed_from_double(local.x), wl_fixed_from_double(local.y));
 }
 
 void CWLTouchResource::sendFrame() {
-    if (!owner || !currentSurface)
+    if (!owner)
         return;
 
     resource->sendFrame();

src/protocols/core/Seat.hpp

@@ -46,6 +46,8 @@ class CWLTouchResource {
     SP<CWlTouch>           resource;
     WP<CWLSurfaceResource> currentSurface;
 
+    int                    fingers = 0;
+
     struct {
         CHyprSignalListener destroySurface;
     } listeners;