Restrict autoScale to Allowed Values Only

[ShahzaibIbrahim]

We need to enforce stricter validation on the autoScale parameter. Currently, unsupported values such as half and int200 are being used. To ensure consistent functionality and reduce errors, we will now throw an SWT error if an unsupported value is provided.

Allowed Values:

• quarter
• exact
• false
• Any numeric value (e.g., 166)

Disallowed Values:

• half
• int200
• Any value not included in the above whitelist

Expected Behavior:

Users attempting to set autoScale to any value outside the allowed list will encounter an SWT error with a clear message indicating the invalid value and the list of permitted options.

[akoch-yatta]

Important Only in combination with autoScale.updateOnRuntime = true

[akoch-yatta]

Extension: We should extend the check for the (experimental) flag -> only allow checking it, when a valid scaling mode is configured

[HeikoKlare]

Extension: We should extend the check for the (experimental) flag -> only allow checking it, when a valid scaling mode is configured

This is actually not that easy to achieve: everything related to these scaling modes is hidden in the DPIUtil class, which is internal, So without accessing internal code or replicating some of its implementation, it is currently not possible to realize this. This might be something we could provide as proper API for Display once we also agree on the one for activating the scaling as well.

[akoch-yatta]

Ah okay, you are right, then it is not in scope for this ticket, I would say. This should never happen anyway, unless you are doing something explicitly e.g. in the ini