wmaker: filter inotify events only to expected config files

This patch is checking if the notification wmaker is receiving
from the Defaults directory is coming from a proper expected config file.
Until now, using vim for example to open any of the files,
for example WMRootMenu would reload the configs, even before saving
the file.
You would see in the logs:
warning: Inotify: Reading config files in defaults database.

because vim by default is creating a .swp file in that same directory.

src/event.c

@@ -357,11 +357,29 @@ static void handle_inotify_events(void)
 
 			wPreferences.flags.noupdates = 1;
 		}
-		if ((pevent->mask & IN_MODIFY) && oneShotFlag == 0) {
+		/* Only react when a known config file inside the Defaults directory is affected */
+		if (pevent->len > 0) {
+			char *fname = pevent->name;
+			const char *allowed[] = { "WMRootMenu", "WMWindowAttributes",
+						  "WindowMaker", "WMState", "WMGLOBAL", NULL };
+			int i, matched = 0;
+
+			for (i = 0; allowed[i]; i++) {
+				if (strcmp(fname, allowed[i]) == 0) {
+					matched = 1;
+					break;
+				}
+			}
+
+			if (matched) {
+				/* react to events that indicate a file was created/moved/written */
+				if ((pevent->mask & (IN_MODIFY | IN_CLOSE_WRITE | IN_MOVED_TO | IN_CREATE)) && oneShotFlag == 0) {
 					wwarning(_("Inotify: Reading config files in defaults database."));
 					wDefaultsCheckDomains(NULL);
 					oneShotFlag = 1;
 				}
+			}
+		}
 
 		/* move to next event in the buffer */
 		i += sizeof(struct inotify_event) + pevent->len;