Increase the maximum number of concurrent DNS queries from 32 to 256

This makes the following error message less likely to be printed
when performing many concurrent HTTP requests:

    Condition ' resolving == IP::RESOLVER_INVALID_ID ' is true. returned: ERR_BUG

core/io/ip.cpp

@@ -184,7 +184,7 @@ IP::ResolverID IP::resolve_hostname_queue_item(const String &p_hostname, IP::Typ
 }
 
 IP::ResolverStatus IP::get_resolve_item_status(ResolverID p_id) const {
-	ERR_FAIL_INDEX_V(p_id, IP::RESOLVER_MAX_QUERIES, IP::RESOLVER_STATUS_NONE);
+	ERR_FAIL_INDEX_V_MSG(p_id, IP::RESOLVER_MAX_QUERIES, IP::RESOLVER_STATUS_NONE, vformat("Too many concurrent DNS resolver queries (%d, but should be %d at most). Try performing less network requests at once.", p_id, IP::RESOLVER_MAX_QUERIES));
 
 	IP::ResolverStatus res = resolver->queue[p_id].status.get();
 	if (res == IP::RESOLVER_STATUS_NONE) {
@@ -195,7 +195,7 @@ IP::ResolverStatus IP::get_resolve_item_status(ResolverID p_id) const {
 }
 
 IP_Address IP::get_resolve_item_address(ResolverID p_id) const {
-	ERR_FAIL_INDEX_V(p_id, IP::RESOLVER_MAX_QUERIES, IP_Address());
+	ERR_FAIL_INDEX_V_MSG(p_id, IP::RESOLVER_MAX_QUERIES, IP_Address(), vformat("Too many concurrent DNS resolver queries (%d, but should be %d at most). Try performing less network requests at once.", p_id, IP::RESOLVER_MAX_QUERIES));
 
 	MutexLock lock(resolver->mutex);
 
@@ -215,7 +215,7 @@ IP_Address IP::get_resolve_item_address(ResolverID p_id) const {
 }
 
 Array IP::get_resolve_item_addresses(ResolverID p_id) const {
-	ERR_FAIL_INDEX_V(p_id, IP::RESOLVER_MAX_QUERIES, Array());
+	ERR_FAIL_INDEX_V_MSG(p_id, IP::RESOLVER_MAX_QUERIES, Array(), vformat("Too many concurrent DNS resolver queries (%d, but should be %d at most). Try performing less network requests at once.", p_id, IP::RESOLVER_MAX_QUERIES));
 
 	MutexLock lock(resolver->mutex);
 
@@ -236,7 +236,7 @@ Array IP::get_resolve_item_addresses(ResolverID p_id) const {
 }
 
 void IP::erase_resolve_item(ResolverID p_id) {
-	ERR_FAIL_INDEX(p_id, IP::RESOLVER_MAX_QUERIES);
+	ERR_FAIL_INDEX_MSG(p_id, IP::RESOLVER_MAX_QUERIES, vformat("Too many concurrent DNS resolver queries (%d, but should be %d at most). Try performing less network requests at once.", p_id, IP::RESOLVER_MAX_QUERIES));
 
 	resolver->queue[p_id].status.set(IP::RESOLVER_STATUS_NONE);
 }

core/io/ip.h

@@ -58,7 +58,7 @@ public:
 	};
 
 	enum {
-		RESOLVER_MAX_QUERIES = 32,
+		RESOLVER_MAX_QUERIES = 256,
 		RESOLVER_INVALID_ID = -1
 	};
 

doc/classes/IP.xml

@@ -103,7 +103,7 @@
 		<constant name="RESOLVER_STATUS_ERROR" value="3" enum="ResolverStatus">
 			DNS hostname resolver status: Error.
 		</constant>
-		<constant name="RESOLVER_MAX_QUERIES" value="32">
+		<constant name="RESOLVER_MAX_QUERIES" value="256">
 			Maximum number of concurrent DNS resolver queries allowed, [constant RESOLVER_INVALID_ID] is returned if exceeded.
 		</constant>
 		<constant name="RESOLVER_INVALID_ID" value="-1">