Auto-mirror some icons according to guidelines

[triallax]

Follow-up to #1387.

Guidelines: https://material.io/design/usability/bidirectionality.html#mirroring-elements

I'm not an expert on this topic, so it would be great if someone more knowledgeable about this would take a quick look and see if I made any mistake.

[triallax]

Should the left and right arrows be mirrored too? I only mirrored the back arrow.

[codecov]

Codecov Report

Merging #1391 (20862d0) into main (c2220e5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1391   +/-   ##
=======================================
  Coverage   13.77%   13.77%           
=======================================
  Files         505      505           
  Lines       21622    21622           
  Branches     3969     3969           
=======================================
  Hits         2978     2978           
+ Misses      17894    17893    -1     
- Partials      750      751    +1     

Impacted Files	Coverage Δ
...oroo/astrid/adapter/CaldavManualSortTaskAdapter.kt	73.68% <0.00%> (-10.53%)	⬇️
...ava/com/todoroo/astrid/gtasks/GtasksListService.kt	80.00% <0.00%> (-3.34%)	⬇️
...ain/java/com/todoroo/astrid/service/TaskDeleter.kt	53.33% <0.00%> (-2.23%)	⬇️
...rc/main/java/com/todoroo/astrid/gcal/GCalHelper.kt	5.17% <0.00%> (-1.73%)	⬇️
...ava/org/tasks/notifications/NotificationManager.kt	5.55% <0.00%> (-1.67%)	⬇️
app/src/main/java/org/tasks/caldav/iCalendar.kt	54.01% <0.00%> (-0.90%)	⬇️
...ava/com/todoroo/astrid/repeats/RepeatTaskHelper.kt	75.22% <0.00%> (-0.89%)	⬇️
...pp/src/main/java/org/tasks/ui/TaskEditViewModel.kt	31.98% <0.00%> (-0.46%)	⬇️
.../main/java/com/todoroo/astrid/service/TaskMover.kt	46.42% <0.00%> (ø)
...ain/java/com/todoroo/astrid/utility/TitleParser.kt	81.46% <0.00%> (+0.69%)	⬆️
... and 8 more

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[abaker]

Thanks, I merged these in 4574a5a. I added mirrors for a couple more movement related ones too (ic_airport_shuttle_24px and ic_outline_directions_walk_24px)

What are your thoughts on these two:

• ic_outline_show_chart_24px: The x-axis on a line chart often reflects the passage of time, so should this be mirrored?
• ic_undo_24px: The undo/redo section in the guidelines were unclear to me, they only showed examples for LTR. Maybe that means its the same in RTL

[triallax]

For the chart icon, I'm not really sure, but I think you can go ahead and mirror it. For the undo icon, I agree that the docs are unclear. Does the undo icon represent going back in time? Or does it represent putting something "back" to how it was? I guess you can mirror it for now, but it probably needs more examination later.

Also, quoting from above since you seemed to have missed it:

Should the left and right arrows be mirrored too? I only mirrored the back arrow.

[abaker]

Sorry, I wasn't sure about those. I just added mirroring back for the arrows, chart, undo, and the subdirectory back button (1f7cb2a). Hopefully someone will complain if anything is wrong