Events with RRULE BYDAY set to day are repeated on day of DTSTART

[HappyLer]

Checklist

• I can reproduce the bug with the latest version.
• I made sure that there are no existing issues - open or closed - to which I could contribute my information to.
• I have read the FAQ and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• This issue contains only one bug.
• I have read and understood the contribution guidelines.

Describe the bug
When importing an ICS event, which has DTSTART on a thursday for example and RRULE BYDAY is set to wednesday, the event will repeat on thursdays.

To Reproduce
Steps to reproduce the behavior:
Such ICS entries can be created using Thunderbird for example and a few calendar apps and programs I tested by hand did not show this behavior. The following event can be used to replicate the issue:

CREATED:20231005T154908Z
LAST-MODIFIED:20231005T155000Z
DTSTAMP:20231005T155000Z
UID:e9185ea1-94b7-45d3-94d5-6fc9b571d734
SUMMARY:StartTHrepWE
RRULE:FREQ=MONTHLY;BYDAY=1WE
DTSTART;TZID=Europe/Berlin:20231005T180000
DTEND;TZID=Europe/Berlin:20231005T190000
TRANSP:OPAQUE
END:VEVENT

Expected behavior
The repeated events should be placed where RRULE points to and not to the first day it happened.

Device info (please complete the following information):

• Model: Samsung Galaxy S10e
• OS: Android 13 (Lineage with MicroG)
• App version 1.0.2

Additional context
I think the issue lies in Parser.kt in line 178, where day is set to the day of the event start timestamp instead of the day from the RRULE. https://github.com/FossifyOrg/Calendar/blob/4363adce4b0d36d44b8fc4de2f87fcb5ba074ef2/app/src/main/kotlin/org/fossify/calendar/helpers/Parser.kt#L180C1-L180C57

[Aga-C]

Can you fix formatting of code snippet? You added ``` without the line break before :)

Also, this issue is valid, however I don't know if it will be done before adding the support for such case while creating events. Now, while creating recurring events, there is no way to set a different day for monthly occurrences.

[HappyLer]

I edited the linebreaks, thanks for the hint.

In my case, the events get synced from an ics calendar.