Added "selectforeground" and "selectbackground" attributes to CTkComиobox, CTkEntry and CTkTextbox

[kr8589]

selectbackground − Background color for the selected items of the widget.

selectforeground − Foreground color for the selected items of the widget.

Tkinter's Entry, Textbox, and Combobox have these attributes.

In CTkEntry and CTkTextbox, I added them to the dictionaries _valid_tk_entry_attributes and _valid_tk_text_attributes. For CTkCombobox, I used the default template of the file and added it like the others.

I tested it with code and select text in widgets with mouse:

selected_color = self._apply_appearance_mode(ctk.ThemeManager.theme["CTkButton"]["fg_color"])
self.Combo_Box_my = ctk.CTkComboBox(self.Frame_my, hover=True, values=list(mylist.keys()), command=self.mycommand, selectbackground=selected_color)
self.Entry_my = ctk.CTkEntry(self.Frame_my, selectbackground=selected_color)
self.scrolled_text_my = ctk.CTkTextbox(self.Frame_my, state='disabled', width=400, height=200, selectbackground=selected_color) 

result: theme button color (green, blue or dark-blue) selected text on combobox's entry, entry and textbox. selectforeground color behaves similarly but for foreground. If text in textbox already has color, the color doesn't change.

self.Combo_Box_my = ctk.CTkComboBox(self.Frame_my, hover=True, values=list(mylist.keys()), command=self.mycommand, selectbackground="red") 

result: red selected text on combobox's entry, similar behavior for entry and textbox.

self.Combo_Box_my = ctk.CTkComboBox(self.Frame_my, hover=True, values=list(mylist.keys()), command=self.mycommand)

result: default (windows 10 blue) selected text on combobox's entry, entry and textbox, similar behavior for entry and textbox.

Images: