We can have a work around for this situation.
Install Compiz config settings, and use 2 more plugins: Place Windows and Window Rules.
- On Window Rules, choose the "Size Rule" tab.
-- Add a new rule with this settings:
---- Sized Windows: type=dialog
---- X size and Y size about 800x600
- On Place Windows, choose Fixed Window Placement:
-- Add a Windows with Fixed position:
------ type=dialog
------ XY position : 150 x 200 (please choose as you like, but test carefully. I still don't get what is the best position in this settings).
After these steps, whenever I open a dialog like Save, Save as, Open, etc, the window will be placed center of the screen, and the dimension are 800x600. Don't know if this will cause any issue.
We can have a work around for this situation.
Install Compiz config settings, and use 2 more plugins: Place Windows and Window Rules.
- On Window Rules, choose the "Size Rule" tab.
-- Add a new rule with this settings:
---- Sized Windows: type=dialog
---- X size and Y size about 800x600
- On Place Windows, choose Fixed Window Placement:
-- Add a Windows with Fixed position:
------ type=dialog
------ XY position : 150 x 200 (please choose as you like, but test carefully. I still don't get what is the best position in this settings).
After these steps, whenever I open a dialog like Save, Save as, Open, etc, the window will be placed center of the screen, and the dimension are 800x600. Don't know if this will cause any issue.