Suppress popup for fatal error after tellusererror

For cooperating better with Polyglot, and allowing more to-the-point
error messaging, the (awful) default message will be suppressed if the
dying engine already provided an explanation for its demise to the user.

diff --git a/backend.c b/backend.c
index 58f8079..91f6e8d 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -7938,7 +7938,7 @@ HandleMachineMove (char *message, ChessProgramState *cps)
     ChessMove moveType;
     char promoChar;
     char *p, *pv=buf1;
-    int machineWhite;
+    int machineWhite, oldError;
     char *bookHit;
 
     if(cps == &pairing && sscanf(message, "%d-%d", &savedWhitePlayer, &savedBlackPlayer) == 2) {
@@ -7952,7 +7952,7 @@ HandleMachineMove (char *message, ChessProgramState *cps)
        return; // Skim the pairing messages here.
     }
 
-    cps->userError = 0;
+    oldError = cps->userError; cps->userError = 0;
 
 FakeBookMove: // [HGM] book: we jump here to simulate machine moves after book hit
     /*
@@ -8532,7 +8532,7 @@ if(appData.debugMode) fprintf(debugFP, "nodes = %d, %lld\n", (int) programStats.
            }
            if(GetDelayedEvent()) CancelDelayedEvent(), ThawUI(); // [HGM] cancel remaining loading effort scheduled after feature timeout
            DisplayMessage("", ""); // erase waiting message
-           DisplayError(buf1, 0);
+           if(!oldError) DisplayError(buf1, 0); // if reason neatly announced, suppress general error popup
        }
        return;
     }