player: only coalesce callbacks from parsed config files

This relaxes what bbac628a1b introduced.
Although it is rare, there may be scripts out there that depend on the
old timing. We'd still like to process config files in a sane manner and
not cause OOMs so keep the general coalescing mechanism in place but use
it selectively. There is one special case with the --input-commands
option. We want this coalesced as well so some special handling needs to
be added for that.

options/m_config_frontend.c

@@ -737,6 +737,9 @@ int m_config_set_option_cli(struct m_config *config, struct bstr name,
         param = bstr0("no");
     }
 
+    if (flags & M_SETOPT_FROM_CONFIG_FILE)
+        co->coalesce = true;
+
     // This is the only mandatory function
     mp_assert(co->opt->type->parse);
 

options/m_config_frontend.h

@@ -49,6 +49,7 @@ struct m_config_option {
     bool is_set_from_config : 1;    // Set by a config file
     bool is_set_locally : 1;        // Has a backup entry
     bool warning_was_printed : 1;
+    bool coalesce : 1;              // Property changes should be coalesced
     int32_t opt_id;                 // For some m_config APIs
     const char *name;               // Full name (ie option-subopt)
     const struct m_option *opt;     // Option description

options/m_property.h

@@ -147,6 +147,8 @@ struct m_property {
     void *priv;
     // Special-case: mark options for which command.c uses the option-bridge
     bool is_option;
+    // Special-case: option-bridge properties should be coalesced
+    bool coalesce;
 };
 
 struct m_property *m_property_list_find(const struct m_property *list,