Pinned items in the clipboard are duplicated

[Uranusek]

Describe the bug
Pinned items duplicate when you change the keyboard.

To Reproduce

1. Copy something
2. Pin it
3. Change the keyboard and return to HeliBoard
4. Notice that the pinned item has been duplicated

Expected behavior
Pinned items are not duplicated

Screenshots

screen-20240401-195831_1_1.mp4

screen-20240401-195831_1_1bh.mp4

App version
HeliBoard 1.0. I will check if the bug is present in the previous version, but I doubt it, because I would have noticed.

Device (please complete the following information):

• Model: Motorola
• OS: Android 11

Additional context
Generally with the clipboard something strange is happening. You can see in the video. Elements seem to disappear, but immediately reappear.
Moments earlier, the pinned items could not be unpinned and only forcing the keyboard to close helped. Now I can't reproduce it.

[codokie]

#611 I believe this should prevent the duplication, although in ClipboardHistoryManager, I think the historyEntries should not be a companion object?
It survives a keyboard change all right, but onCreate() calls loadPinnedClips() which essentially adds duplicates.

[codokie]

Actually if historyEntries is not a companion object, a keyboard change would destroy all non-pinned items which is probably not warranted for.
So not adding anything if the history is not empty would be more efficient 0992bbc

[iamgitcat]

This bug is really annoying.