layout/algo: fix swar on removing a target (#13427)

ref https://github.com/hyprwm/Hyprland/discussions/13422

hyprtester/src/tests/main/layout.cpp

@@ -0,0 +1,54 @@
+#include "../shared.hpp"
+#include "../../shared.hpp"
+#include "../../hyprctlCompat.hpp"
+#include "tests.hpp"
+
+static int  ret = 0;
+
+static void swar() {
+    OK(getFromSocket("/keyword layout:single_window_aspect_ratio 1 1"));
+
+    Tests::spawnKitty();
+
+    {
+        auto str = getFromSocket("/activewindow");
+        EXPECT_CONTAINS(str, "at: 442,22");
+        EXPECT_CONTAINS(str, "size: 1036,1036");
+    }
+
+    Tests::spawnKitty();
+
+    OK(getFromSocket("/dispatch killwindow activewindow"));
+
+    Tests::waitUntilWindowsN(1);
+
+    {
+        auto str = getFromSocket("/activewindow");
+        EXPECT_CONTAINS(str, "at: 442,22");
+        EXPECT_CONTAINS(str, "size: 1036,1036");
+    }
+
+    // clean up
+    NLog::log("{}Killing all windows", Colors::YELLOW);
+    Tests::killAllWindows();
+}
+
+static bool test() {
+    NLog::log("{}Testing layout generic", Colors::GREEN);
+
+    // setup
+    OK(getFromSocket("/dispatch workspace 10"));
+
+    // test
+    NLog::log("{}Testing `single_window_aspect_ratio`", Colors::GREEN);
+    swar();
+
+    // clean up
+    NLog::log("Cleaning up", Colors::YELLOW);
+    OK(getFromSocket("/dispatch workspace 1"));
+    OK(getFromSocket("/reload"));
+
+    return !ret;
+}
+
+REGISTER_TEST_FN(test);

src/layout/algorithm/Algorithm.cpp

@@ -42,16 +42,16 @@ void CAlgorithm::removeTarget(SP<ITarget> target) {
     const bool IS_FLOATING = std::ranges::contains(m_floatingTargets, target);
 
     if (IS_FLOATING) {
-        m_floating->removeTarget(target);
         std::erase(m_floatingTargets, target);
+        m_floating->removeTarget(target);
         return;
     }
 
     const bool IS_TILED = std::ranges::contains(m_tiledTargets, target);
 
     if (IS_TILED) {
-        m_tiled->removeTarget(target);
         std::erase(m_tiledTargets, target);
+        m_tiled->removeTarget(target);
         return;
     }