V15: Revert "Fix: RTE markup props not up to date issue"

[iOvergaard]

Description

This fixes a regression introduced by #18430 and reported in #18795

Fixes #18795

[Copilot]

Pull Request Overview

This PR reverts a previous fix to address a regression affecting RTE markup props. The changes restore previous behavior in multiple components by reintroducing the use of the original markup values.

• Reverts the change in the tinyMCE property editor component to use an internal _latestMarkup variable.
• Removes an equality check from the TinyMCE input component’s value setter.
• Replaces comparisons of _markup with _latestMarkup in the RTE base component.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/Umbraco.Web.UI.Client/src/packages/tiny-mce/property-editors/tiny-mce/property-editor-ui-tiny-mce.element.ts	Reverts to storing and applying the latest markup using _latestMarkup
src/Umbraco.Web.UI.Client/src/packages/tiny-mce/components/input-tiny-mce/input-tiny-mce.element.ts	Removes an early return check in the value setter
src/Umbraco.Web.UI.Client/src/packages/rte/components/rte-base.element.ts	Updates comparisons to use _latestMarkup and initializes new properties

Comments suppressed due to low confidence (2)

src/Umbraco.Web.UI.Client/src/packages/tiny-mce/property-editors/tiny-mce/property-editor-ui-tiny-mce.element.ts:42

• [nitpick] The inline comment appears ambiguous regarding whether to retrieve the markup via doc.body.innerHTML or another method. Consider clarifying or removing the comment to prevent confusion.

// maybe in this way doc.body.innerHTML;

src/Umbraco.Web.UI.Client/src/packages/tiny-mce/components/input-tiny-mce/input-tiny-mce.element.ts:63

• Removing the equality check may lead to unnecessary updates if the new value is the same as the current one. Consider reintroducing the check if its purpose was to prevent redundant processing.

if (newValue === this.value) return;

[AndyButland]

Can confirm that having checked out this branch, rebuilt and run I no longer see the issue.