RespectSizeHints - bakkeby/dusk GitHub Wiki
If a client has the RespectSizeHints flag set then size hints for the window are respected regardless of whether it is floating or not.
By default size hints are respected for floating windows only, but will apply to all tiled clients as well if the ResizeHints functionality is enabled.
The RespectSizeHints flag is essentially enabling the feature on a per client basis rather than
globally for all windows.