Make using free and custom reading region placement easier to understand

[videosmith]

Bug Description
When indicator is set to manual vertical positioning, adjacent text rows cannot be selected by cursor with mouse.

Steps to Reproduce

1. Load Welcome text
2. Set indicator (left only, no other indicators) to middle
3. Set Reading Region to "Free"
4. Attempt to position cursor on text line adjacent to indicator with mouse, should fail.
5. Set Reading Region back to a preset or select "Custom"
6. Cursor should now be able to set on adjacent text row.
7. Can navigate cursor to affected rows with arrow keys.

Expected behavior
Cursor positioning should be the same under all Reading Region position states

Device information

• QPrompt Version: 1.2 r6 EA
• Operating System: RPi Bookworm, latest updates

[Cuperino]

I know it's not very intuitive, but this is the side effect of making the reading region something you can drag. It moves to in front of the editor, preventing interactions with what is behind it.

What I should do instead is make it more evident that you're only supposed to use Free placement as means to configure Custom placement. Maybe add arrows with animations letting the user know to draw the reading region. Or maybe add a button in the middle of the reading region to fix it in place (that is, switch to what we currently call custom).

[videosmith]

How about after you drag the indicator and release the mouse button the custom state reverts back automatically?

[Cuperino]

That would be insufficient for those wanting the placement to be pixel perfect. This may look a bit ugly, but adding a button or in the middle of the reading region might be the most straight forward solution.

[videosmith]

How about a shift-click drag on the pointer to set it's position and revert the custom state upon release?