Function patchStyle

web/main.js:7025–7084

(el, prev, next)

const CSS_VAR_TEXT = /* @__PURE__ */ Symbol("");
const displayRE = /(?:^|;)\s*display\s*:/;
function patchStyle(el, prev, next) {
  const style = el.style;
  const isCssString = isString(next);
  let hasControlledDisplay = false;
  if (next && !isCssString) {
    if (prev) {
      if (!isString(prev)) {
        for (const key in prev) {
          if (next[key] == null) {
            setStyle(style, key, "");
          }
        }
      } else {
        for (const prevStyle of prev.split(";")) {
          const key = prevStyle.slice(0, prevStyle.indexOf(":")).trim();
          if (next[key] == null) {
            setStyle(style, key, "");
          }
        }
      }
    }
    for (const key in next) {
      if (key === "display") {
        hasControlledDisplay = true;
      }
      const value = next[key];
      if (value != null) {
        if (!shouldPreserveTextareaResizeStyle(
          el,
          key,
          !isString(prev) && prev ? prev[key] : void 0,
          value
        )) {
          setStyle(style, key, value);
        }
      } else {
        setStyle(style, key, "");
      }
    }
  } else {
    if (isCssString) {
      if (prev !== next) {
        const cssVarText = style[CSS_VAR_TEXT];
        if (cssVarText) {
          next += ";" + cssVarText;
        }
        style.cssText = next;
        hasControlledDisplay = displayRE.test(next);
      }
    } else if (prev) {
      el.removeAttribute("style");
    }
  }
  if (vShowOriginalDisplay in el) {
    el[vShowOriginalDisplay] = hasControlledDisplay ? style.display : "";
    if (el[vShowHidden]) {
      style.display = "none";
    }