Render all selected clips (with fade ins and fade outs)

Hello Jack,
Try this:

function getOriginalToolSelection() {
    // Get original Tools Selection
    const originalToolSelection = sf.ui.proTools.mainWindow.cursorToolCluster.buttons.filter(btn =>
        btn.title.value == "Smart tool" ||
        btn.title.value == "Trim tool" ||
        btn.title.value == "Selector tool" ||
        btn.title.value.startsWith("Grabber tool")
    ).filter(btn => btn.value.invalidate().value === "Selected")
    return originalToolSelection
};


function setOriginalToolSelection(originalToolSelection) {
    ///Set Original Tools Selection
    originalToolSelection.map(selBtn => selBtn.title.value).indexOf("Smart Tool") > 0 ?
        originalToolSelection.filter(selBtn => selBtn.title.value === "Smart Tool")[0].elementClick() :
        originalToolSelection[0].elementClick()
};


function setGrabberTool() {
    const grabberToolToolBtn = sf.ui.proTools.mainWindow.groups.allItems[2].buttons.whoseTitle.startsWith('Grabber tool').first

    grabberToolToolBtn.elementClick();
    grabberToolToolBtn.popupMenuSelect({
        isRightClick: true,
        menuPath: ['Object']
    });
};





function main() {
    sf.ui.proTools.appActivateMainWindow();
    sf.ui.proTools.invalidate();


    const selectedTracksH = sf.ui.proTools.selectedTrackHeaders;
    const originalToolSelection = getOriginalToolSelection()
    const getOriginalSelectionEnd = sf.ui.proTools.selectionGetInSamples().selectionEnd

    // Select grabber tool
    setGrabberTool();

    // Dor for each selected track
    selectedTracksH.map(track => {

        // Track select & scroll to view
        track.trackSelect();
        track.trackScrollToView();


        // Do for each selected clip
        sf.ui.proTools.clipDoForEachSelectedClip({
            action: () => {


                // Using grabber will select the complete clip including fades, 
                //group + undo will get the currect timeline selection
                sf.ui.proTools.menuClick({ menuPath: ["Clip", "Group"] })
                sf.ui.proTools.menuClick({ menuPath: ["Edit", "Undo Group Clips"] });

                // Using grabber will select the next clip after initial selection, 
                // checking its start to prevent selection
                const getCurrentSelectionStart = sf.ui.proTools.selectionGetInSamples().selectionStart;
                if (getCurrentSelectionStart > getOriginalSelectionEnd) return;

                // Clip consolidate
                sf.ui.proTools.clipConsolidate();
            },
        });
    });


    // Set original Tool Selection and Track Selection
    setOriginalToolSelection(originalToolSelection);
    sf.ui.proTools.trackSelectByName({ names: selectedTracksH.map(n => n.normalizedTrackName) });
};


main();

Good to hear its working so far. Keep testing and let me know how it goes.