Drop-down shows up in the wrong place when changing between languages with different scripts

Relates to MCL-23195.

The Bug:

The drop-down in the top left/right corner shows up in the wrong place when changing between languages with different scripts.

For example, changing from English to Arabic (from left-to-right to right-to-left script) will display the drop-down in the top left corner, although it should be displayed in the top right. Only if you reboot the Launcher will the position for the drop-down update and work as expected.

Steps to Reproduce:

• Open the launcher and go to "Settings" > "Languages".
• Select a language with a different script from what is currently selected.
  (ex: English → Arabic OR Arabic → English).
• Click on the drop-down in the top left/right corner.

→  The drop-down appears on the same side as before changing language even though the UI has been inverted.

Observed Behavior:

The drop-down appears on the opposite side of the UI button when changing between languages with different scripts.

Expected Behavior:

The drop-down always appears on the same side as the UI button, as expected.