Replaced QLineedit by QComboBox for frequency input (for phasor and AC temporal diagram dialogs) #723
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The aim of this PR is to replace the QLineEdit by a QComboBox as the frequency input widget at the dialog window in the phasor and AC temporal diagrams. This way, the QCombo shows only the available frequencies.
In order to do that, a function named 'LoadAvailableFreqs()' has been added to diagramdialog constructor. The purpose of this function is to explore the content of the 'acfrequency' field of the current dataset and, finally, it returns that data as a QStringList which is used to feed the QComboBox.
'LoadAvailableFreqs()' is called at the constructor but also when the click() event of the 'ChooseData' combo is triggered.
Screencast here