Mouse selection bug with Tab characters in TextArea with soft_wrap disabled

[TheNaterz]

The following code creates 2 TextAreas pre-populated with 20 Tab characters.

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

class MyApp(App):

    def compose(self) -> ComposeResult:
        yield TextArea(
            id='textarea1',
            soft_wrap=False,
            text="\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
        )
        yield TextArea(
            id='textarea2',
            soft_wrap=True,
            text="\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
        )

if __name__ == "__main__":
    MyApp().run()

The first TextArea has soft_wrap disabled, while the second one does not.

By using a mouse to select the Tab characters, the selection in the first TextArea incorrectly jumps forward 1 tab character per space. The selection in the second TextArea follows the expected behavior.

Textual Diagnostics

Versions

Name	Value
Textual	0.85.2
Rich	13.9.4

Python

Name	Value
Version	3.12.0
Implementation	CPython
Compiler	MSC v.1935 64 bit (AMD64)
Executable	C:\Program Files\Python312\python3.exe

Operating System

Name	Value
System	Windows
Release	10
Version	10.0.19045

Terminal

Name	Value
Terminal Application	Windows Terminal
TERM	Not set
COLORTERM	Not set
FORCE_COLOR	Not set
NO_COLOR	Not set

Rich Console options

Name	Value
size	width=188, height=52
legacy_windows	False
min_width	1
max_width	188
is_terminal	True
encoding	utf-8
max_height	52
justify	None
overflow	None
no_wrap	False
highlight	None
markup	None
height	None

[github-actions]

We found the following entries in the FAQ which you may find helpful:

• How do I center a widget in a screen?
• Why doesn't Textual look good on macOS?

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[github-actions]

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