Fix compose form submission reloading web interface (#19762)

* Fix compose form submission reloading web interface

Fix regression introduced by #19742

* Fix various compose form buttons being handled like submit buttons

* Fix coding style issue

* Fix missing onClick prop check

app/javascript/mastodon/features/compose/components/compose_form.js

@@ -93,7 +93,7 @@ class ComposeForm extends ImmutablePureComponent {
     return !(isSubmitting || isUploading || isChangingUpload || length(fulltext) > 500 || (isOnlyWhitespace && !anyMedia));
   }
 
-  handleSubmit = () => {
+  handleSubmit = (e) => {
     if (this.props.text !== this.autosuggestTextarea.textarea.value) {
       // Something changed the text inside the textarea (e.g. browser extensions like Grammarly)
       // Update the state to match the current text
@@ -105,6 +105,10 @@ class ComposeForm extends ImmutablePureComponent {
     }
 
     this.props.onSubmit(this.context.router ? this.context.router.history : null);
+
+    if (e) {
+      e.preventDefault();
+    }
   }
 
   onSuggestionsClearRequested = () => {
@@ -217,7 +221,7 @@ class ComposeForm extends ImmutablePureComponent {
     }
 
     return (
-      <form className='compose-form'>
+      <form className='compose-form' onSubmit={this.handleSubmit}>
         <WarningContainer />
 
         <ReplyIndicatorContainer />
@@ -280,9 +284,8 @@ class ComposeForm extends ImmutablePureComponent {
         <div className='compose-form__publish'>
           <div className='compose-form__publish-button-wrapper'>
             <Button
-              type="submit"
+              type='submit'
               text={publishText}
-              onClick={this.handleSubmit}
               disabled={!this.canSubmit()}
               block
             />