Feature request: window resize pop-up

[xzfc]

I'm submitting a…

[ ] Bug
[x] Feature Request
[ ] Documentation Request
[ ] Other (Please describe in detail)

Intro

When you resize a terminal emulator window, some WMs display a pop-up hint with the terminal emulator size, in screen cells (not pixels). I find it useful, e.g., when you need to resize the terminal the to be at least of the specific size.

Particularly, openbox, metacity, gnome-shell do it by default. To get size in cells, they check width_inc/height_inc fields in WM_NORMAL_HINTS property, as encouraged by ICCCM:

width = base_width + ( i x width_inc )
height = base_height + ( j x height_inc )
Window managers are encouraged to use i and j instead of width and height in reporting window sizes to users. If a base size is not provided, the minimum size is to be used in its place and vice versa.

By default, these WMs only do so when resize increments are more than 1. So, in practice, only terminal emulator windows are affected, but not, e.g., browser windows.

Desired Behavior

Display similar pop-up when resizing a window in i3.

Impact

[ ] This feature requires new configuration and/or commands

It could be made non-configurable, though a configuration option could be added, similar to openbox: show_resize_popup always|newer|nonpixel.

Environment

i3 version 4.23 (2023-10-29) © 2009 Michael Stapelberg and contributors

[i3bot]

Please note that new features which require additional configuration will usually not be considered. We are happy with the feature set of i3 and want to focus in fixing bugs instead. We do accept feature requests, however, and will evaluate whether the added benefit (clearly) outweighs the complexity it adds to i3.

Keep in mind that i3 provides a powerful way to interact with it through its IPC interface: https://i3wm.org/docs/ipc.html.