My suggestion is to allow you to re-size the window while the game is in windowed mode.

+1 great idea

...or you can go ESC>settings>options>advanced> and the change the window height and width at the bottom to whatever you want.

You can already change the resolution of your client in a variety of ways.

You can change it by editing default.cfg, through Options, and by typing /re [width] [height].

Isn't it /re [width] [height]?
I had a problem with this and i remember having to type /re, not /rf, unless there are 2 ways while in-game..

I think he means, stretching it like you do with various windows, such as a Google Chrome window, you can chose the defined window size as you please.

This ^^

I understand I can change the resolution by typing in the exact measurements I'd like, but I would like it if you could re-size the window (clicking the restore button to stretch the window to fit inside your resolution precisely) and stretch it freely rather than being constricted to entering in the dimensions. I think it would be a good implementation as it would be very efficient.

I guess that would be an ok thing to add. doesn't seem like it would be hard to do, but I dont know much about programming.

Supported.
I do not know what sizes are for my screen that is open
I would like this so it will be easier for me and others to resize the screen in like seconds, unlike testing all the sizes to see which you like.

I keep putting the width and height at a smaller number mistakenly putting it to small i cant reach the width&height bar, i thought just dragging the sides of the window to the desired length would make everything much better.I'd really like if hampa added this to a newer version please ;u;