Fixed the bug with linearlayout's divider in RTL

[grzesiek2010]

Closes #6362

Why is this the best possible solution? Were any other approaches considered?

There’s a bug with the LinearLayout divider in RTL mode: https://issuetracker.google.com/issues/110104700 that causes this issue. Since it won’t be fixed, we’ll need an alternative to handle the spacing between buttons correctly. Switching to ConstraintLayout isn’t an option, as we deliberately used LinearLayout to address specific requirements (see #5942). The easiest and safest solution for now is to show or hide a divider view programmatically.

How does this change affect users? Describe intentional changes to behavior and behavior that could have accidentally been affected by code changes. In other words, what are the regression risks?

We need to test the display of the two buttons on the form end screen - Save as draft and Finalize (or Send, depending on settings). We don’t need to test their functionality, only the visual aspects:

• Ensure they display correctly in RTL mode.
• Check the layout when one button is missing (disabled in settings).
• Confirm that both buttons expand proportionally: Button size differs at the end of form screen. #5942
• Verify that the maximum width of the parent container is 640dp.

Do we need any specific form for testing your changes? If so, please attach one.

No.

Does this change require updates to documentation? If so, please file an issue here and include the link below.

No.

Before submitting this PR, please make sure you have:

• added or modified tests for any new or changed behavior
• run ./gradlew connectedAndroidTest (or ./gradlew testLab) and confirmed all checks still pass
• added a comment above any new strings describing it for translators
• added any new strings with date formatting to DateFormatsTest
• verified that any code or assets from external sources are properly credited in comments and/or in the about file.
• verified that any new UI elements use theme colors. UI Components Style guidelines

[dbemke]

Tested with Success!

Verified on a device with Android 8.1, 10, 14

Verified cases:

• issue doesn’t occur
• RTL set in Collect and in the device settings
• 1 or 2 buttons at the end page
• different random languages
• different font sizes
• dark and light mode
• portrait and landscape view
• regression checks in buttons in RTL

[WKobus]

Tested with Success

Verified on device with Android 11, 15