main-pane default layouts not getting reasonable sizes

[oblitum]

For the following session:

session_name: foo
windows:
- layout: main-vertical
  panes:
  - blank
  - blank
  - blank

The result is:

Where the main pane is the left one, it's smaller than the others non main panes.

• tmuxp load -d ./foo.yaml
• tmux 2.6/2.5
• tmuxp 1.3.5/1.3.2
• libtmux 0.7.7/0.7.1

[tony]

@oblitum reported this in #309/#312

#312 (comment)

#312 (comment)

I have experienced the same issue since 2.6

[tony]

I'm getting this behavior with vanilla tmux

outside of tmux:

# create a fresh tmux client/server with no config
tmux -L test -f /dev/null

inside the new tmux session:

tmux setw main-pane-width 30
tmux split-window
tmux selectl main-vertical

[tony]

@oblitum can you reproduce #314 (comment)?

I experienced the same issue as @oblitum. However, for me it began when using tmux 2.6. The main-pane-height and main-pane-width began being smaller, requiring me to make a larger value for it.

If I set to 30, it's 30 characters/cells wide.

If I set to 60, it's 60 cells wide.

I guess it's more accurate now?

However, the issue I have with this is I don't want a number of cells, I want a percentage (just like what we -p gives in splitw, but I want it to automatically adjust with selectl). Here's what I did with a main-horizontal layout to make it work via proportions: https://github.com/tony/tmux-config/blob/092ef9b/.tmux.conf#L73

bind m run-shell "tmux setw main-pane-height $(expr $(tmux display -p '#{window_height}') / 3 \* 2); tmux select-layout main-horizontal"

I guess the equivalent with main-pane-width would be:

bind m run-shell "tmux setw main-pane-width $(expr $(tmux display -p '#{window_width}') / 3 \* 2); tmux select-layout main-vertical"

Down the line: we could make it so tmuxp set main-pane-{width/height} to a percentage via the config. In fact, we could actually make the percentage persist by creating a hook on client-resized.

[oblitum]

I experienced the same issue as @oblitum. However, for me it began when using tmux 2.6

I have the same behavior for the issue's test case on tmux 2.5.

Regarding the other manual width setting, I have never used those, I have only set width/height inside tmuxp's yamls. I think I do prefer the way it's working, I see no issue or change regarding this, for example, I have several yaml's where I set main-pane-width: 160, and it has always worked, and still is, as I'd expect. So, this is solely a matter of the defaults for "main layouts" being saner.

[oblitum]

I have just tested this on tmux 2.5, tmuxp 1.3.2. The behavior is still the same. So I think I may only have noticed this meanwhile the recent issues. I don't know at which point it ever started to behave differently than I'd expect.

Still, main-pane-width, etc, is working as it was before, so I don't expect its behavior to change.

[tony]

@oblitum I made a script to resize by % https://devel.tech/tips/n/tMuXrSz9/resize-tmux-main-panes-by-percentage/ / https://github.com/tony/tmux-config/blob/master/scripts/resize-adaptable.sh

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[Abdull]

Can we reopen this issue? I'm on tmux 3.1c and cannot get main-pane-width to work.