undo: rename to reques_undo/redo

Author: abique

include/clap/ext/draft/undo.h

@@ -168,9 +168,13 @@ typedef struct clap_host_undo {
    // Note: this maybe a complex and asynchronous operation, which may complete after
    // this function returns.
    //
+   // Note: the host may ignore this request if there is no undo/redo step to perform,
+   // or if the host is unable to perform undo/redo at the time (eg: a long running
+   // change is going on).
+   //
    // [main-thread]
-   void(CLAP_ABI *undo)(const clap_host_t *host);
-   void(CLAP_ABI *redo)(const clap_host_t *host);
+   void(CLAP_ABI *request_undo)(const clap_host_t *host);
+   void(CLAP_ABI *request_redo)(const clap_host_t *host);
 
    // Subscribes to or unsubscribes from undo context info.
    //