<div class="gpii-prefsEditor-adjusterPanel">
    <h4 class="gpiic-textSize-label"></h4>

    <div class="gpii-prefsEditor-previewPerSettingContainer">
        <div class="gpii-prefsEditor-adjusterIcons gpii-prefsEditor-previewPerSettingEye"></div>
        <div class="gpii-prefsEditor-previewPerSettingEyeBackground"></div>
        <iframe class="gpiic-textSize-preview gpiic-adjuster-preview gpii-prefsEditor-previewPerSettingFrame" src="" frameborder="0"></iframe>
    </div>

    <div class="gpiic-textSize-stepper gpii-stepper gpii-stepper-pmt">
        <label class="gpiic-textfieldStepper-decrement gpii-stepper-buttons"></label>
        <input type="text" class="gpiic-textfieldStepper-valueField gpii-stepper-valueField fl-inputs"/>
        <label class="gpiic-textfieldStepper-unitField gpii-stepper-unit"></label>
        <label class="gpiic-textfieldStepper-increment gpii-stepper-buttons"></label>
    </div>
</div>

<div class="gpii-prefsEditor-adjusterPanel">
    <h4 class="gpiic-textSize-label"></h4>

    <div class="gpii-prefsEditor-previewPerSettingContainer">
        <div class="gpii-prefsEditor-adjusterIcons gpii-prefsEditor-previewPerSettingEye"></div>
        <div class="gpii-prefsEditor-previewPerSettingEyeBackground"></div>
        <iframe tabindex="-1" class="gpiic-textSize-preview gpiic-adjuster-preview gpii-prefsEditor-previewPerSettingFrame" src="" frameborder="0"></iframe>
    </div>

    <div class="gpiic-textSize-stepper gpii-stepper gpii-stepper-pmt">
        <label class="gpiic-textfieldStepper-decrement gpii-stepper-buttons"></label>
        <input type="text" class="gpiic-textfieldStepper-valueField gpii-stepper-valueField fl-inputs"/>
        <label class="gpiic-textfieldStepper-unitField gpii-stepper-unit"></label>
        <label class="gpiic-textfieldStepper-increment gpii-stepper-buttons"></label>
    </div>
</div>

Make the textSize preview frame non-focusable.
GPII-599: Make the textSize preview frame non-focusable.