New FEM CalculiX incrementation settings

[FEA-eng]

fixes #12357

• adds minimum and maximum time increment properties for CalculiX solver settings (also in FEM preferences)
• replaces the Iterations Thermo Mech Maximum property with a general property working also in static analyses

@marioalexis84 Can you check it?

[marioalexis84]

Sorry for the delay.
The old IterationsThermoMechMaximum property still needs to be managed on document restore for old projects.

[FEA-eng]

Sorry for the delay. The old IterationsThermoMechMaximum property still needs to be managed on document restore for old projects.

No problem. Done, thanks. Is the rest of the code ok (mainly default, min and max possible values of the new properties)?

[marioalexis84]

There is a specific class Gui::PrefQuantitySpinBox that uses units inside the spin box, there is no need to combine a PrefDoubleSpinBox with an additional unit label (as currently used in the file).
Do not repeat widget names to avoid a warning on compilation.

[FEA-eng]

There is a specific class Gui::PrefQuantitySpinBox that uses units inside the spin box, there is no need to combine a PrefDoubleSpinBox with an additional unit label (as currently used in the file).

I would leave it for now because it has always been like that in this file. I can try to correct it in another PR.

Do not repeat widget names to avoid a warning on compilation.

Corrected.

[marioalexis84]

Fix value alignment like in the other widgets.

[FEA-eng]

It was like this before but I corrected it now.

[FEA-eng]

@marioalexis84 I've noticed that the 2 new properties (Time Minimum Step and Time Maximum Step) are getting reset when changed from defaults in Preferences. What I mean is that I change them, click OK and go back to Preferences only to see them unchanged. Do you know what can be the cause?

[marioalexis84]

PrefWidget class has onSave and onRestore methods that must be called in saveSettings and loadSettings methods of PreferencePage class, respectively.
So, in DlgSettingsFemCcxImp.cpp file, you must call:
In the DlgSettingsFemCcxImp::saveSettings function:

    ui->dsb_ccx_maximum_time_step->onSave();
    ui->dsb_ccx_minimum_time_step->onSave();

And in the DlgSettingsFemCcxImp::loadSettings function:

    ui->dsb_ccx_maximum_time_step->onRestore();
    ui->dsb_ccx_minimum_time_step->onRestore();

Note that dsb_ccx_*_time_step are the names you assigned to the preference widgets inside the ui file.

[FEA-eng]

@marioalexis84 Thanks a lot, it's working now.