Edit the content of the cache, container and context macros in place

The content of the cache, container and context macros is rich text, but the WYSIWYG editor never edits it in place, not even right after the insertion: the editor shows the rendered content as a read-only widget, and changing it needs the Edit Macro dialog, where it is a plain text area in the syntax of the page. The async macro, the sibling of cache, has its content edited in place right after the insertion, and the box macro, like container a layout macro, always has. An empty macro is worse: it shows only the "macro:cache", "macro:container" or "macro:context" placeholder, which one click selects but never puts the cursor in, so the content can only be typed in the Edit Macro dialog.

The macros to change, with the file where most of the fix is done:

• cache: CacheMacro.java.
• container: AbstractContainerMacro.java. The macro does not mark its parsed content as non-generated content, unlike box.
• context: ContextMacro.java.

The fix is to mark the output of the content as editable in place, as the macros whose content is edited in place do, so that the editor can edit it, also after the page is saved and reopened. An empty content must stay a visible area that one click puts the cursor in, also right after the insertion from Quick Actions.

Once the content is edited in place, it must also be when the macro is in a box, and, with XWIKI-19954 and XWIKI-23309, in a list item or a table cell.

KOs covered

Impact found on macro fluidity

These 10 KOs come from the WYSIWYG usability audit of the macros, under the criteria E6 inplace, E5 empty, I2 zero-config and E3 nesting of its usability criteria, which ask that the content is edited in place, with an editing experience suited to its data, not in a text area of the Edit Macro dialog, that an empty content stays visible and editable, with no area that cannot receive the cursor, and that inserting a macro with only default values gives a sensible result. The page of each macro, linked in the table, has the full notes and the steps to reproduce. It is also needed by XWIKI-25563, so that the Quick Action can insert the cache macro without the Edit Macro dialog, and by the issues that put the cursor in the content after the insertion.

The I2 zero-config KO of container is only partly covered here, for the empty content. The same KO also reports that no layout is applied with the default values, covered by XWIKI-25482.

The E3 nesting KOs of cache and container are only partly covered here, for the content edited in place. The same KOs also report problems covered by XWIKI-19954 and XWIKI-23309 for the inline macros and the table cells, and by XWIKI-23501 for container used in a list or a table.