[Glitch] Fix: Prevent submission using same logic as submit button disabling.

Port 6a895e1ab3 to glitch-soc

app/javascript/flavours/glitch/features/composer/index.js

@@ -150,6 +150,9 @@ const handlers = {
     const {
       onChangeText,
       onSubmit,
+      isSubmitting,
+      isUploading,
+      anyMedia,
       text,
     } = this.props;
 
@@ -159,6 +162,11 @@ const handlers = {
       onChangeText(value);
     }
 
+    // Submit disabled:
+    if (isSubmitting || isUploading || (!!text.length && !text.trim().length && !anyMedia)) {
+      return;
+    }
+
     //  Submits the status.
     if (onSubmit) {
       onSubmit();