Enable commit button only if something has changed

templates/repo/editor/commit_form.tmpl

@@ -77,7 +77,7 @@
 			</div>
 		{{end}}
 	</div>
-	<button id="commit-button" type="submit" class="ui primary button">
+	<button id="commit-button" type="submit" class="ui primary button" {{if .PageIsEdit}}disabled{{end}}>
 		{{if eq .commit_choice "commit-to-new-branch"}}{{ctx.Locale.Tr "repo.editor.propose_file_change"}}{{else}}{{ctx.Locale.Tr "repo.editor.commit_changes"}}{{end}}
 	</button>
 	<a class="ui button red" href="{{if .ReturnURI}}{{.ReturnURI}}{{else}}{{$.BranchLink}}/{{PathEscapeSegments .TreePath}}{{end}}">{{ctx.Locale.Tr "repo.editor.cancel"}}</a>