The OS project Home Assistant uses CodeMirror for its browser-based yaml editor for its UI. I’m a user of the system, and I, along with many others, experience situations that appear as seemingly random (and so far not easily reproducible on demand) odd behavior within the editor function where the text begins to appear reversed at it is typed. It will initially work correctly upon entering the editor, but randomly change to displaying typed text in reverse.
For example, in the editor, I could be entering the following CodeMirror, but what is displayed as I am typing is rorriMedoC, with the cursor moving to the left.
Oddly, both Del and Backspace work as expected. I’ve been tracing through the Event logs in Firefox when it happens and it’s quite complex, but so far have found nothing obvious that would point to such behavior (comparing the events during which the correct text is being displayed and the reversed text is being displayed).
What is peculiar, is that as soon as I type a character, it appears, but the cursor is on it LEFT, not the right as is normally the case. I type another character, which appears to the LEFT of the previous character, and once again, the cursor is to the LEFT of the last displayed character.
As an indication of its “randomness”, I was in the middle of reviewing a session’s events where the behavior was being exhibitied, and took a break to enter this post. Upon going back to the tab where the editor was still waiting, I began typing again, and the text is now being displayed CORRECTLY.
So, this appears to be no only event-related (perhaps in how CodeMirror is being used by HA), but also somehow depending on elapsed time. Note that the direction parameter shows up repeatedly and it is always ltr. If I change it in the browser dev tools, it reverses everything, as you would expect.
I was hoping someone here who is more familiar with CodeMirror could provide some possible insight into what might be going on and/or at least where to start looking. Thanks in advance.