TYPO3 Core

I can confirm this problem.

The window position is "absolute" with "top: 0". So it depends on the parent windows current position. Switching to "position: fixed" solves this problems, but the content area is still "locked" after close...

I can confirm this problem.

The popup window "Insert Link" is draggable. This behaviour does not work correctly anymore if [[79271.patch]] is applied. If the parent window is scrolled down, the patch makes the window jump to a new position after dragging.

We can also confirm this problem.

We implemented the posted css (79271.patch) fix in our backend css in our provider extension.

// Backend CSS Datei einbinden
if (TYPO3_MODE === 'BE') {
    $GLOBALS['TBE_STYLES']['skins'][$_EXTKEY]['stylesheetDirectories'][] = 'EXT:' . $_EXTKEY . '/Resources/Public/Css/backend/';
}

The JavaScript part (79271-2.patch) was a bit more tricky without touching the core files. We solved it by overriding the onClose function inside the ext_tables.php in our provider extension:

$pageRenderer = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Page\PageRenderer::class);
$pageRenderer->loadRequireJsModule(
    'TYPO3/CMS/Rtehtmlarea/HTMLArea/Plugin/Plugin',
    'function(Plugin) {
        Plugin.prototype.onClose = function() {
            // Restore window before closing, to avoid residual classes on container
            this.dialog.restore();
             this.removeListeners();
             this.editor.focus();
             this.restoreSelection();    
         }
    }'
);

Best regards

// set in condition, otherwise amd problems will occur in FE
if (TYPO3_MODE === 'BE') {
    # fix for RTE popup bug https://forge.typo3.org/issues/79271
    $pageRenderer = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Page\PageRenderer::class);
    $pageRenderer->loadRequireJsModule(
        'TYPO3/CMS/Rtehtmlarea/HTMLArea/Plugin/Plugin',
        'function(Plugin) {
        Plugin.prototype.onClose = function() {
            // Restore window before closing, to avoid residual classes on container
            this.dialog.restore();
             this.removeListeners();
             this.editor.focus();
             this.restoreSelection();    
         }
    }'
    );
}