improvement for touch devices

frontend/src/Components/MarkdownEditor.svelte

@@ -76,6 +76,7 @@
     function oncontextmenu(evt){
          evt.preventDefault();
          evt.stopPropagation();
+         startEdit();
          return false;
     }
 
@@ -121,8 +122,9 @@
 {#if editing}
     <div class="boundary">
         <textarea bind:value={editValue.source} onkeyup={typed} autofocus={!simple}></textarea>
+        <button class="cancel" onclick={e => editing = false}>{t('cancel')}</button>
         <button class="save" onclick={doSave}>{t('save')}</button>
     </div>
 {/if}
-<svelte:element this={type} {onmousedown} {onmouseup} {ontouchstart} {ontouchend} {oncontextmenu} class={{editable}} title={t('long_click_to_edit')} >{@html target(editValue.rendered)}</svelte:element>
+    <svelte:element this={type} {onclick} {oncontextmenu} class={{editable}} title={t('long_click_to_edit')} >{@html target(editValue.rendered)}</svelte:element>
 </div>