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Created attachment 18705 [details]
The initial pull request for this feature (#441) explains that on backgrounding, AppCompat hides the soft keyboard but doesn't show it when the app resumes. Hence a new platform-specific is added to control whether the soft keyboard is displayed or not.
However, in my sample (attached) the soft keyboard is shown (when the soft keyboard input mode is set to AdjustResize) on resume, regardless of the value of ShouldPreserveKeyboardOnResume. As per the PR, the soft keyboard is never shown when its input mode is Pan.
1. Run app and navigate to the lifecycle events page.
2. Click in the Entry to display the soft keyboard.
3. Pause/sleep the app.
4. Resume the app.
Result: The soft keyboard is displayed when the app resumes.
Expected result: The soft keyboard isn't displayed because ShouldPreserveKeyboardOnResume = false (set in App.xaml).
I can confirm that AdjustResize seems to be showing keyboard automatically. At the time I wrote the PR, this didn't seem to be the case, so I'm not sure what got changed. There was a lot of activity in 2.3.4-pre1.
For now, we could revert this change and add it back in if we need it. We could provide sample code to go with it.
Please note that changing to AdjustResize seems to be creating a white background at the top. See https://developer.xamarin.com/guides/xamarin-forms/user-interface/platform-specifics/consuming/#soft_input_mode
This doesn't look good at all. Can you please review this PR: https://github.com/xamarin/Xamarin.Forms/pull/422? It's been almost two months since it was submitted. I believe it could fix the white background issue. The problem is that Resize is pushing the underlay below (the underlay can be visible underneath the white background) AND the status bar has no color set so its transparency shows white.
This PR (https://github.com/xamarin/Xamarin.Forms/pull/552) will let you skip adding the underlay for full customization.
This whole underlay stuff seems to be added for XF's hacky MasterDetailPage solution.
Updating that this still occurs as of the 184.108.40.206-nightly.
Please follow the issue on GitHub for updates. Thank you.