fix: input.add_callback and blocks placing when shift pressed

src/logic/scripting/lua/libinput.cpp

@@ -31,16 +31,17 @@ static int l_mousecode(lua_State* L) {
     return 1;
 }
 
-static int l_add_callback(lua_State* L) {
+static int l_add_callback(lua_State*) {
     auto bindname = state->requireString(1);
     const auto& bind = Events::bindings.find(bindname);
     if (bind == Events::bindings.end()) {
         throw std::runtime_error("unknown binding "+util::quote(bindname));
     }
     state->pushvalue(2);
+    runnable actual_callback = state->createRunnable();
     runnable callback = [=]() {
         if (!scripting::engine->getGUI()->isFocusCaught()) {
-            state->createRunnable();
+            actual_callback();
         }
     };
     if (hud) {

src/physics/PhysicsSolver.cpp

@@ -33,6 +33,7 @@ void PhysicsSolver::step(
     hitbox->grounded = false;
     for (uint i = 0; i < substeps; i++) {
         float px = pos.x;
+        float py = pos.y;
         float pz = pos.z;
         
         vel += gravity * dt * gravityScale;
@@ -44,6 +45,9 @@ void PhysicsSolver::step(
         vel.z *= glm::max(0.0f, 1.0f - dt * linear_damping);
 
         pos += vel * dt + gravity * gravityScale * dt * dt * 0.5f;
+        if (hitbox->grounded) {
+            pos.y = py;
+        }
 
         if (shifting && hitbox->grounded){
             float y = (pos.y-half.y-E);
@@ -220,6 +224,7 @@ bool PhysicsSolver::isBlockInside(int x, int y, int z, Hitbox* hitbox) {
 }
 
 bool PhysicsSolver::isBlockInside(int x, int y, int z, Block* def, blockstate state, Hitbox* hitbox) {
+    const float E = 0.001f; // inaccuracy
     const glm::vec3& pos = hitbox->position;
     const glm::vec3& half = hitbox->halfsize;
     const auto& boxes = def->rotatable 
@@ -228,10 +233,9 @@ bool PhysicsSolver::isBlockInside(int x, int y, int z, Block* def, blockstate st
     for (const auto& block_hitbox : boxes) {
         glm::vec3 min = block_hitbox.min();
         glm::vec3 max = block_hitbox.max();
-        // 0.00001 - inaccuracy
-        if (min.x < pos.x+half.x-x-0.00001f && max.x > pos.x-half.x-x+0.00001f &&
-            min.z < pos.z+half.z-z-0.00001f && max.z > pos.z-half.z-z+0.00001f &&
-            min.y < pos.y+half.y-y-0.00001f && max.y > pos.y-half.y-y+0.00001f)
+        if (min.x < pos.x+half.x-x-E && max.x > pos.x-half.x-x+E &&
+            min.z < pos.z+half.z-z-E && max.z > pos.z-half.z-z+E &&
+            min.y < pos.y+half.y-y-E && max.y > pos.y-half.y-y+E)
             return true;
     }
     return false;