Page Comparison

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.event.type.EventDispatchOption;
import com.atlassian.jira.issue.ModifiedValue
import com.atlassian.jira.issue.util.DefaultIssueChangeHolder

def customFieldManager = ComponentAccessor.customFieldManager
def issueManager = ComponentAccessor.issueManager
def issueService = ComponentAccessor.issueService
def loggedInUser = ComponentAccessor.jiraAuthenticationContext.loggedInUser

def issue = issueManager.getIssueObject("PROJ-7")
def changeHolder = new DefaultIssueChangeHolder()
def inputParameters = issueService.newIssueInputParameters()
def myval = "- ToDo List\n+ Checked\nx Skipped\n~ In Progress\n# Another ToDo List\n- Unchecked\n> Quote line 1 https://rw.rw\\n> Quote line 2\n> Quote line 3\n"

// a text field
def textCf = customFieldManager.getCustomFieldObjectByName("Checklists")
inputParameters.addCustomFieldValue(textCf.getId(), myval);
def updateValidationResult = issueService.validateUpdate(loggedInUser, issue.getId(), inputParameters);
if (updateValidationResult.isValid()) {
	def result = issueService.update(loggedInUser, updateValidationResult, EventDispatchOption.ISSUE_UPDATED, false);
	if (!result.isValid()) {
		return result.getErrorCollection().getErrors().toString();
    }
} else {
    return updateValidationResult.getErrorCollection().getErrorMessages();
}