Could you please generate a GUI using PyQt that has an upper multiline editable text window and a button labelled A, followed by a lower panel that is split into two columns, each with non-editable but scrollable multiline text fields, accompanied by buttons B and C, respectively. On pressing button A, the text in the editable text window should undergo dummy processing by conversion to lower case, with the results inserted into the left non-editable text window. On pressing B, the text should be processed again, to uppercase, and pasted into the right noneditable text window. On pressing C, a text file should be written consisting of the contents of all three text fields .
I will replace the dummy processing functions with more useful processing later.