Inline glitch with 1 line screen

[willmcgugan]

I think there is a glitch when an inline app is 1 character high. The line gets repeated.

This occurred when a Tree was auto height, and there was a single node.

[TomJGooding]

I'm probably wrong, but from a quick look at the InlineUpdate maybe this is where the cursor isn't moved up when there's only the single 'strip' (line) to render?

textual/src/textual/_compositor.py

Lines 153 to 157 in cbef6cd

	if len(self.strips) > 1:
	back_lines = len(self.strips) if self.clear else len(self.strips) - 1
	append(f"\x1b[{back_lines}A\r") # Move cursor back to original position
	else:
	append("\r")

Here's my quick MRE if it helps:

from textual.app import App, ComposeResult
from textual.widgets import Tree


class InlineGlitchApp(App):
    CSS = """
    Screen:inline {
        border: none;
    }

    Tree {
        height: auto;
    }
    """

    def compose(self) -> ComposeResult:
        tree = Tree("This line gets repeated each time I'm expanded...")
        tree.root.add_leaf("...then collapsed again")
        yield tree


if __name__ == "__main__":
    app = InlineGlitchApp()
    app.run(inline=True)

[willmcgugan]

That does look like it could be the culprit!

[willmcgugan]

Thanks for the MREs, Tom. Always a big help.

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