Hide the bottom navigation bar when a text file preview is shown

[daniele-verducci]

Fix #17495

🖼️ Screenshots

🏚️ Before	🏡 After

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included 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?)

🤖 AI (if applicable)

• The content of this PR was partly or fully generated using AI

Changes

This hides the bottom navigation bar that was covering part of a previewed text file.

How to reproduce:

• download a text file
• open it
• note the bottom bar over the text (on master)

[daniele-verducci]

@tobiasKaminsky should I check what's the popped fragment here? I didn't because, as far as I can see, the default status is for the bottom navigation to be visible. This is similar to what happens to resetScrolling().

[github-actions]

APK file: https://github.com/nextcloud/android/actions/runs/32240739106/artifacts/9360935236
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[github-actions]

APK file: https://github.com/nextcloud/android/actions/runs/32345524977/artifacts/9398145437
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[github-actions]

Codacy

SpotBugs

Category	Base	New
Bad practice	32	32
Correctness	59	59
Dodgy code	207	207
Experimental	1	1
Malicious code vulnerability	2	2
Multithreaded correctness	25	25
Performance	39	39
Security	19	19
Total	384	384

[github-actions]

blue-Light-Screenshot test failed, but no output was generated. Maybe a preliminary stage failed.