fixed debugging w/ input events

src/baseplatform.ts

@@ -266,21 +266,21 @@ export abstract class BaseDebugPlatform extends BasePlatform {
     this.resume();
   }
   preFrame() {
-  }
-  postFrame() {
-    if (this.debugCallback) {
-      if (this.debugBreakState) {
-        // reload debug state at end of frame after breakpoint
-        this.loadState(this.debugBreakState);
-      } else {
-        // save state every frame and rewind debug clocks
-        this.debugSavedState = this.saveState();
-        this.debugTargetClock -= this.debugClock;
-        this.debugClock = 0;
-      }
+    // save state before frame, to record any inputs that happened pre-frame
+    if (this.debugCallback && !this.debugBreakState) {
+      // save state every frame and rewind debug clocks
+      this.debugSavedState = this.saveState();
+      this.debugTargetClock -= this.debugClock;
+      this.debugClock = 0;
     }
     this.frameCount++;
   }
+  postFrame() {
+    // reload debug state at end of frame after breakpoint
+    if (this.debugCallback && this.debugBreakState) {
+      this.loadState(this.debugBreakState);
+    }
+  }
   pollControls() {
   }
   nextFrame(novideo : boolean) {

src/emu.ts

@@ -248,7 +248,7 @@ export class AnimationTimer {
       } catch (e) {
         this.running = false;
         this.pulsing = false;
-        throw new EmuHalt(e);
+        throw e; // TODO: throw EmuHalt hides stack trace
       }
     }
     if (this.useReqAnimFrame)

src/ui.ts

@@ -1693,7 +1693,7 @@ function installErrorHandler() {
         var msgstr = msgevent+"";
         console.log(msgevent, url, line, col, error);
         // emulation threw EmuHalt
-        if (error instanceof EmuHalt || msgstr.indexOf("CPU STOP") >= 0) {
+        if (error instanceof EmuHalt || msgstr.indexOf("CPU STOP") >= 0) { // TODO
           showErrorAlert([ {msg:msgstr, line:0} ]);
           uiDebugCallback(platform.saveState && platform.saveState());
           setDebugButtonState("pause", "stopped");