[RTL] Pressing the Home key on the editor textbox where the first word is a placeholder will not place the cursot at the beginning

[ItielMaN]

Pressing the Home key while being focused on a translation in the editor and while the first word in the translation is a placeholder, will place the cursor after the placeholder and not before it.
Pressing Home again will place it at the very beginning. Pressing then Home again and again will cycle between placing the cursor before and after the placeholder, while seeing the cursor move visibly 1-2 milimeters each time.
This is relevant only when the text is RTL btw.

This can be seen here:
https://pontoon.mozilla.org/he/firefoxcom/all-resources/?string=319534

This is especially annoying when I want to enter an RLM character before an LTR term (which is being represented by a placeholder) and don't know where it's going to end up...

CC @eemeli

[eemeli]

I currently only have access to a Macbook without a physical Home key, but there are indeed some oddities happening here. Using any of the following, I sometimes manage to get the switching to be between the two ends of the placeholder, and sometimes dancing a few pixels side-to-side:

• Up
• Fn + Left
• Cmd + Right

In LTR layouts, no such oddities are present.