App size is locked to the initial terminal window size

Solution

The issue existed only in a poetry 1.2.0 shell - updating it to >1.2.0 solved the issue.

Original Issue

Instead of the App expanding to fill the width / height of the terminal emulator window, it remembers the first time a terminal app (e.g. kitty, foot, terminator) runs Textual, and then uses those window dimension on each subsequent run.

The app also doesn’t resize when the window is resized.

The above shows kitty (left) with the same app running in foot (right), however, the left window is “stuck” to the dimensions I initially used for kitty.

The same issue exists for a blank app with no CSS and only a Placeholder Widget:

based off of

class BlankApp(App):
    def compose(self) -> ComposeResult:
        yield Placeholder()

app = BlankApp()

I use fish but running it from bash has the same result.

Packages :

• Python 3.10.7
• textual 0.5.0 Modern Text User Interface framework

System:

and in case it’s useful, the devtool output on launching the above BlankApp() invoked with textual run --dev main.py

[voxofox]

Yessss 😃)) That did the trick! Thanks @darrenburns ❤️

For anyone else : a restart of the terminal is needed too.

[darrenburns]

Your shell has $COLUMNS and $LINES variables which should get updated whenever you resize your terminal window. We’ve seen issues in the past where these variables weren’t being updated for some reason (in my case, it wasn’t being updated inside poetry shell on v1.2.0 of poetry).

If you run echo $COLUMNS, resize your terminal windows, then run echo $COLUMNS again, does the value printed change to reflect the new width of your terminal window? It’s possible it’s getting stuck.