Redmine

Simple solution for this problem is as follows:

html[dir="rtl"],
html:has(head link[rel="stylesheet"][href*="/rtl"]) {
  .contextual .drdn-content {
    inset-inline-start: auto;
    inset-inline-end: 0;

    a.icon {
      padding-inline-start: 24px;
      padding-inline-end: 0;
      background-position-x: calc(100% - 4px);

      /* For Redmine 6 and lator */
      &:has(svg) {
        padding-inline-start: 0;
      }
    }
  }
}