Combat: fix silent-aim spread seed and lead projectiles

- Silent aim and triggerbot set IN_ATTACK after CInput::CreateMove, so the
  minimal-spread seed was never applied to their shots. Re-apply
  spread_control_apply after setting the attack button, then update the CRC.
- Crossbow bolts and RPG rockets are not hitscan. Lead the selected hitbox by
  target velocity * travel time; the crossbow bolt also gets its 0.05 gravity
  drop (30 u/s^2). Apply the same correction to the smooth aimbot.
- Document both paths in CONTEXT.

1 files changed, 10 insertions, 2 deletions

diff --git a/src/hl2h.cpp b/src/hl2h.cpp
index 256b9ab..4f5673f 100644
--- a/src/hl2h.cpp
+++ b/src/hl2h.cpp
@@ -689,13 +689,21 @@ static void do_move(int seq, float frametime) {
     }
 
     if (feature_active(FEAT_TRIGGERBOT)) {
-      if (triggerbot_apply(cmd))
+      if (triggerbot_apply(cmd)) {
+        // Triggerbot sets IN_ATTACK after CInput's spread hook, so the best
+        // seed has to be applied here as well.
+        spread_control_apply(cmd, ent);
         note_modified(cmd, flags, vel);
+      }
     }
 
     if (feature_active(FEAT_SILENTAIM)) {
-      if (silent_aim_apply(cmd))
+      if (silent_aim_apply(cmd)) {
+        // Silent aim also sets IN_ATTACK late; without this the shot keeps
+        // the random CInput seed instead of the minimal-spread seed.
+        spread_control_apply(cmd, ent);
         note_modified(cmd, flags, vel);
+      }
     }
   }
 }