fixes share link

[RamReso]

Resolves #4010

The problem was:

• when sharing a link with nextcloud talk the link disappears.

General Observations:

• Depending on the Type that is shared with nextcloud talk the behavior of the app differs:
  • e.g. when sharing a text it is copied into the sharedText in ConversationsListActivity which then opens the chatActivity which then opens MessageInputFragment, where then the sharedText is set into the binding.fragmentMessageInputView.inputEditText, but then not send.
  • when sharing a photo showSendFilesConfirmDialog gets called in ConversationsListActivity which then uploads the photo

How it is fixed

• just send the message with the sharedText in MessageInputFragment

Problems with the fix

• there is no confirmation dialog, if one really wants to share a link with a certain chat (which could be bad for a person like me, that likes to accidentally press the wrong chat)
• it is not possible to share a link without notification

🚧 TODO

• get some feedback

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included or not needed
• 🔖 Capability is checked or not needed
• 🔙 Backport requests are created or not needed: /backport to stable-xx.x
• 📅 Milestone is set
• 🌸 PR title is meaningful (if it should be in the changelog: is it meaningful to users?)

[mahibi]

Thank you @RamReso

The expected behavior is that the shared text is just pasted into the textfield, so it's possible to edit it and there is no need for a confirm dialog.

The main problem here was that the shared text was set into the textfield, but it was immediately overwritten with "" in the restoreState method.

I created the PR #4139 which should fix it.

I will close your PR but thanks again to have a look!

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