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Created attachment 3127 [details]
visual description of the bug

Hello,

see the attached image for better comprehension
I use borderless window i have the 2.0.7 runtime binairies for windows (using windows 10) 

some time when resizing a window (making it bigger), the displayable part of the window does not resize. but the window effectively resized (the window is clickable on the new size , the renderer has the new size etc... but the displayed part is cutted and the remaining space is transparent (when clicking in the transparent space the event are register)) . this bug happens maybe every 1 on 10 resize .

to resize the window i use : 

        void DisplayWindow::set_x(int val) {
		x = val;
		SDL_SetWindowPosition(SDL_id, x, y);
		check_max();
	}
	void DisplayWindow::set_y(int val) {
		y = val;
		SDL_SetWindowPosition(SDL_id, x, y);
		check_max();
	}
	void DisplayWindow::set_w(int val) {
		width = val;
		SDL_SetWindowSize(SDL_id, width, height);
	}
	void DisplayWindow::set_h(int val) {
		height = val;
		SDL_SetWindowSize(SDL_id, width, height);
	}

these function 

the intended result and result when buged can be seen in the attached file.

I think the bug comes from SDL since in SDL it is not possible to have a part of the window transparent. 

if you need other information please ask

Thank you